taxonID	type	description	language	source
64617B3FFF71FFA616B7FE69FC23FAB9.taxon	materials_examined	TYPE SPECIES: Coahuilites sheltoni Böse, 1928: 283, pl. 13, figs. 4 – 11, by original designation. Coahuilites sheltoni Böse, 1928 Figures 7 – 10	en	LANDMAN, NEIL H., COBBAN, WILLIAM A. (2003): Ammonites from the Upper Part of the Pierre Shale and Fox Hills Formation of Colorado. American Museum Novitates 3388: 1-46, DOI: 10.1206/0003-0082(2003)388<0001:AFTUPO>2.0.CO;2, URL: http://www.bioone.org/doi/abs/10.1206/0003-0082%282003%29388%3C0001%3AAFTUPO%3E2.0.CO%3B2
64617B3FFF71FFA616B7FE69FC23FAB9.taxon	materials_examined	TYPE: Holotype, by original designation, is the original specimen of Böse (1928: pl. 13, fig. 7) from the Escondido Formation about 3 mi (4.8 km) south of Alamo Viejo in the region of Villa de Juarez, Coahuila, Mexico. MATERIAL: Seven specimens, mostly whorl fragments without outer shell: USNM 519508 from the upper transition member of the Pierre Shale, about 400 ft (121.9 m) below the Laramie coal, SW ¼ sec. 34, T 13 S, R 58 W, Elbert County, Colorado; USNM 519509, 519517, and 519518 from the Fox Hills Formation, about 40 ft (12.2 m) below the Milliken Sandstone Member, NW ¼, NE ¼ sec. 34, T 4 N, R 67 W, Weld County, Colorado (fig. 1, loc. 15); DMNH 23359 from the upper transition member of the Pierre Shale, NE ¼ sec. 27, T 6 S, R 58 W, Elbert County, Colorado (fig. 1, loc. 17); AMNH 47397 from the Fox Hills Formation, about 40 ft (12.2 m) below the Milliken Sandstone Member, center, line between secs. 23 and 26, T 4 N, R 67 W, Wildcat Mound, about 2 mi (3.2 km) south of Milliken, Weld County, Colorado (fig. 1, loc. 25); and USNM 519520 from the base of the upper transition member of the Pierre Shale, NW ¼, SW ¼ sec. 5, T 5 S, R 69 W, Jefferson County, Colorado (fig. 1, loc. 27).	en	LANDMAN, NEIL H., COBBAN, WILLIAM A. (2003): Ammonites from the Upper Part of the Pierre Shale and Fox Hills Formation of Colorado. American Museum Novitates 3388: 1-46, DOI: 10.1206/0003-0082(2003)388<0001:AFTUPO>2.0.CO;2, URL: http://www.bioone.org/doi/abs/10.1206/0003-0082%282003%29388%3C0001%3AAFTUPO%3E2.0.CO%3B2
64617B3FFF71FFA616B7FE69FC23FAB9.taxon	description	DESCRIPTION: DMNH 23359 is a fragment of a body chamber, a little less than one­half whorl in angular length, with most of the right side worn away (fig. 7 C, D). The specimen is an internal mold with patches of nacreous shell still attached in places. An imprint of a large bryozoan colony occurs on the adapical half of the specimen. The estimated whorl height at the adoral end of the specimen is 65.0 mm. Coiling is very involute, but the umbilicus is not preserved. The inner flanks are slightly concave and the out­ er flanks are very broadly rounded to nearly flat and converge toward the venter. The ventrolateral shoulder is broadly rounded. The venter is moderately well rounded with a blunt midventral ridge on the adapical end of the specimen, which weakens adorally. The patch of shell on the inner flanks bears delicate, straight, prorsiradiate ribs. There is a row of four sharp nodes on the midflanks. The nodes are evenly spaced at distances of approximately 18 – 20 mm. They give rise to weak ribs that join six low, elongate nodes on the ventrolateral margin. These nodes are evenly spaced at distances of approximately 20 – 25 mm. The venter is smooth. USNM 519508 is a fragment of an internal mold of the adoral end of the phragmocone and adapical end of the body chamber (fig. 7 A, B). It is approximately one­third whorl in angular length. It is very involute, but the umbilicus is not preserved. The estimated whorl height at the adapical end of the specimen is 46.0 mm. The whorl section is compressed with maximum width at one­third whorl height. The ratio of whorl width to whorl height at the adapical end of the specimen is 0.48. The inner one­third of the flanks is very concave and the outer twothirds is very broadly rounded and converges toward the venter. The venter is sharply rounded with a very weak midventral ridge on the phragmocone. There is a row of six concave bullae at one­third whorl height. They are evenly spaced at distances of approximately 10 – 11 mm. There is a row of seven low swellings on the ventrolateral margin. The venter is smooth. The suture has a broad shallow external lobe (E) with a broad, little incised median saddle (fig. 8). The first lateral saddle (E / L) is split in two by a broad, moderately incised lobe. All adjacent saddles have entire terminations. USNM 519509 is a partially crushed internal mold 119.0 mm in diameter (fig. 9). It comprises part of the inner whorls of the phragmocone and approximately one­half whorl of the body chamber. The whorl section at the adoral end of the specimen is compressed with maximum width at midwhorl height; the ratio of whorl width to whorl height is 0.47. As in the other specimens, the shell is very involute. The inner flanks are concave and the outer flanks are very broadly rounded and converge toward the venter. The ventrolateral shoulder is moderately well rounded and the venter is well rounded to weakly fastigate. There is a row of 10 nodes on the midflanks of the last whorl, five on the phragmocone, and five on the body chamber. The nodes are more or less evenly spaced at distances of approximately 15 mm. A row of five nodate swellings occurs on the ventrolateral margin of the body chamber. No ribbing is present. USNM 519520 is one­half whorl long and 125 mm in diameter (fig. 10). It comprises the adapical end of the phragmocone and most of the body chamber. It is an internal mold with patches of shell preserved. Most of the venter and left side of the specimen are missing. The inner whorls are preserved, showing an ontogenetic change in whorl shape, especially a progressive rounding of the venter. The whorl width and height at the base of the body chamber are 21.6 mm and 48.5 mm, respectively; the ratio of whorl width to height is 0.44. The inner one­third of the flanks is very concave and the outer two­thirds is broadly rounded and converges toward the venter. The venter is well rounded with a weak midventral ridge. Maximum width occurs at midwhorl height. There is a row of seven sharp bullae at one­third whorl height. The bullae become progressively more widely spaced adorally; the distance between the two most adoral bullae is about 17 mm. A row of low nodate swellings is also present near the ventrolateral shoulder. AMNH 47397 (not illustrated) is a small scrap of the ventral part of the phragmocone. The venter is well rounded to weakly fastigate. The suture is well exposed and matches that of USNM 519508 (fig. 8).	en	LANDMAN, NEIL H., COBBAN, WILLIAM A. (2003): Ammonites from the Upper Part of the Pierre Shale and Fox Hills Formation of Colorado. American Museum Novitates 3388: 1-46, DOI: 10.1206/0003-0082(2003)388<0001:AFTUPO>2.0.CO;2, URL: http://www.bioone.org/doi/abs/10.1206/0003-0082%282003%29388%3C0001%3AAFTUPO%3E2.0.CO%3B2
64617B3FFF71FFA616B7FE69FC23FAB9.taxon	discussion	DISCUSSION: USNM 519508, which was collected by J. B. Reeside, Jr., in 1932, was described by Lavington (1933: 404) from the ‘‘ transition zone’ ’ of the Pierre Shale below the Fox Hills Formation. All of the Colorado specimens are similar to those reported from the Fox Hills Formation of Niobrara County, Wyoming (Kennedy et al., 1996: 6 – 11, figs. 3, 4 B). OCCURRENCE: Coahuilites sheltoni occurs in the Baculites clinolobatus and Hoploscaphites birkelundae zones of the Western Interior (fig. 11, appendix). It is recorded from the Fox Hills Formation in Niobrara County, Wyoming (Kennedy et al., 1996), and the upper part of the Pierre Shale and Fox Hills Formation in Elbert, Jefferson, and Weld counties, Colorado (Kennedy et al., 1996). The species has also been reported from Trans­Pecos Texas and northern Mexico (Cooper, 1970) and from the Prairie Bluff Chalk in Alabama and Mississippi (Cobban and Kennedy, 1995).	en	LANDMAN, NEIL H., COBBAN, WILLIAM A. (2003): Ammonites from the Upper Part of the Pierre Shale and Fox Hills Formation of Colorado. American Museum Novitates 3388: 1-46, DOI: 10.1206/0003-0082(2003)388<0001:AFTUPO>2.0.CO;2, URL: http://www.bioone.org/doi/abs/10.1206/0003-0082%282003%29388%3C0001%3AAFTUPO%3E2.0.CO%3B2
64617B3FFF73FFBE1567FA07FE9CFC49.taxon	materials_examined	TYPE SPECIES: Ammonites lenticularis Owen, 1852: 579 (non Young and Bird, 1828: 269, fig. 5), by original designation, = Ammonites lobata Tuomey, 1856: 168.	en	LANDMAN, NEIL H., COBBAN, WILLIAM A. (2003): Ammonites from the Upper Part of the Pierre Shale and Fox Hills Formation of Colorado. American Museum Novitates 3388: 1-46, DOI: 10.1206/0003-0082(2003)388<0001:AFTUPO>2.0.CO;2, URL: http://www.bioone.org/doi/abs/10.1206/0003-0082%282003%29388%3C0001%3AAFTUPO%3E2.0.CO%3B2
64617B3FFF73FFBE1567FA07FE9CFC49.taxon	materials_examined	TYPE: The holotype is USNM 9888, said to be from ‘‘ Jacun, 3 miles [4.8 km] below Laredo, ’’ but probably from the Escondido Formation of the Rio Grande Region, probably in Maverick County, Texas (Stephenson, 1941, 1955). MATERIAL: Five USNM specimens, most of which are fragments: USNM 77358 from the Milliken Sandstone Member of the Fox Hills Formation, sec. 35, T 7 N, R 66 W, Weld County, Colorado (fig. 1, loc. 18); USNM 519507 from the upper part of the Pierre Shale, NW ¼ sec. 3, T 2 N, R 68 W, Weld County, Colorado (fig. 1, loc. 16); USNM 519506 from the Fox Hills Formation, 5 mi (8.0 km) west and 2.5 mi (4.0 km) north of Ault, Weld County, Colorado (fig. 1, loc. 14); and USNM 519510 and 519519 from near the top of the Pierre Shale or lower part of the Fox Hills Formation, SW ¼, SE ¼ sec. 35, T 6 N, R 67 W, Weld County, Colorado (fig. 1, loc. 20).	en	LANDMAN, NEIL H., COBBAN, WILLIAM A. (2003): Ammonites from the Upper Part of the Pierre Shale and Fox Hills Formation of Colorado. American Museum Novitates 3388: 1-46, DOI: 10.1206/0003-0082(2003)388<0001:AFTUPO>2.0.CO;2, URL: http://www.bioone.org/doi/abs/10.1206/0003-0082%282003%29388%3C0001%3AAFTUPO%3E2.0.CO%3B2
64617B3FFF73FFBE1567FA07FE9CFC49.taxon	description	DESCRIPTION: USNM 519506 is a fragment of an internal mold nearly one­half whorl long (fig. 12). It consists of the adoral part of the phragmocone and the adapical part of the body chamber. It retains part of the shell on the right side. The whorl height at the adoral end of the specimen is 80.8 mm. The whorl section is compressed oxyconic with maximum width at midwhorl height; the ratio of whorl width to whorl height is 0.35. The specimen is involute with a tiny umbi­ licus. The umbilical wall is inclined outward and the umbilical shoulder is broadly round­ ed on the adapical end of the specimen. The umbilical wall becomes steeper and the umbilical shoulder more sharply rounded toward the adoral end of the specimen. The inner flanks are concave, the midflanks are very broadly rounded, and the outer flanks are flat and converge to the acute venter. There is a row of midflank bullae — five on the left side — that are more or less equally spaced at distances of 11 – 13 mm. These bullae seem to disappear toward the adoral end of the specimen, which may be preservational. There is also a row of low swellings on the outer flanks — eight on the left side. They are more or less evenly spaced at distances of approximately 20 mm. Some of these swellings, especially those on the right side, appear to be crescentic. The patches of outer shell on the right side bear fine concave lirae. The suture is characterized by narrow stemmed saddles (fig. 13). USNM 519519 (not illustrated) is a completely septate fragment approximately 0.25 whorl long. It is a slightly distorted internal mold missing part of the inner flanks on the left side. The whorl height at the adoral end of the specimen is approximately 87 mm. The whorl section is oxyconic and there is a row of swellings on the outer flanks (the inner flanks are too poorly preserved to detect bullae). USNM 519510 (fig. 14) is in the same lot as USNM 519519. It is a fragment of the adapical part of the body chamber 0.125 whorl long. The two specimens may belong to the same individual but they do not obviously fit together. The whorl height at the adoral end of USNM 519510 is approximately 130 mm. The left side and the venter of the body chamber are missing. The flanks are very broadly rounded and converge toward the venter. There are two sharp tubercles on the midflanks. What appears to be a lobate muscle scar occurs just adoral of the ultimate septum on the right side (fig. 14). It covers the umbilical wall and extends onto the inner one­quarter of the flanks. The scar is approximately 27 mm wide at its widest point. The scar is demarcated by a slight groove on its adapical side and a faint ridge on its adoral side. It is covered in part with a thin layer of nacre. An impression of the inner whorls occurs on the left side of the specimen. The impression reveals a row of sharp tubercles on the inner flanks and another row of low swellings on the outer flanks. USNM 519507 is an internal mold about one­half whorl long consisting of the adoral part of the phragmocone and adapical part of the body chamber (fig. 15). The whorl height at the adoral end of the specimen is approximately 74 mm. The whorl section is oxyconic with the maximum width at midwhorl height; the ratio of whorl width to whorl height is 0.29. There is a row of sharp tubercles at approximately one­third whorl height and a row of low nodate swellings on the outer flanks. USNM 77358 (not illustrated) is from approximately the same locality as USNM	en	LANDMAN, NEIL H., COBBAN, WILLIAM A. (2003): Ammonites from the Upper Part of the Pierre Shale and Fox Hills Formation of Colorado. American Museum Novitates 3388: 1-46, DOI: 10.1206/0003-0082(2003)388<0001:AFTUPO>2.0.CO;2, URL: http://www.bioone.org/doi/abs/10.1206/0003-0082%282003%29388%3C0001%3AAFTUPO%3E2.0.CO%3B2
64617B3FFF73FFBE1567FA07FE9CFC49.taxon	discussion	DISCUSSION: The presence of two rows of tubercles or nodes distinguishes Sphenodiscus pleurisepta from Sphenodiscus lobatus (Tuomey, 1856). Sphenodiscus pleurisepta differs from Coahuilites sheltoni Böse, 1928, in its compressed, oxyconic whorl section. OCCURRENCE: USNM 519510 and 519519 are in the same lot as USNM 519516, a microconch of Jeletzkytes dorfi. Sphenodiscus pleurisepta occurs in the Hoploscaphites birkelundae Zone of the Pierre Shale in Meade and Pennington counties, South Dakota (Kennedy et al., 1996; Larson et al., 1997), the Fox Hills Formation in Niobrara County, Wyoming (Kennedy et al., 1996), and the upper part of the Pierre Shale and Fox Hills Formation in Weld County, Colorado (Kennedy et al., 1996) (fig. 11, appendix). This species has also been reported from the Escondido Formation in Trans­Pecos Texas and northern Mexico (Stephenson, 1941, 1955), the Corsicana Formation in northern Texas (Kennedy and Cobban, 1993), the Owl Creek Formation in Tennessee, Mississippi, and Missouri (Kennedy and Cobban, 2000), the Prairie Bluff Chalk in Alabama and Mississippi (Cobban and Kennedy, 1995), and the Severn Formation in Maryland (Kennedy et al., 1997).	en	LANDMAN, NEIL H., COBBAN, WILLIAM A. (2003): Ammonites from the Upper Part of the Pierre Shale and Fox Hills Formation of Colorado. American Museum Novitates 3388: 1-46, DOI: 10.1206/0003-0082(2003)388<0001:AFTUPO>2.0.CO;2, URL: http://www.bioone.org/doi/abs/10.1206/0003-0082%282003%29388%3C0001%3AAFTUPO%3E2.0.CO%3B2
64617B3FFF73FFBE1567FA07FE9CFC49.taxon	materials_examined	TYPE SPECIES: Baculites columna Morton, 1834: 44, pl. 19, fig. 8, by subsequent designation by Cobban and Kennedy, 1995: 29.	en	LANDMAN, NEIL H., COBBAN, WILLIAM A. (2003): Ammonites from the Upper Part of the Pierre Shale and Fox Hills Formation of Colorado. American Museum Novitates 3388: 1-46, DOI: 10.1206/0003-0082(2003)388<0001:AFTUPO>2.0.CO;2, URL: http://www.bioone.org/doi/abs/10.1206/0003-0082%282003%29388%3C0001%3AAFTUPO%3E2.0.CO%3B2
64617B3FFF73FFBE1567FA07FE9CFC49.taxon	description	Compare: Trachybaculites columna (Morton, 1834). Cobban and Kennedy, 1995: 29, figs. 10.1, 10.3, 13.4 – 13.6, 14.3, 14.9, 17.1 – 17.14, 17.17 – 17.31 (with complete synonymy).	en	LANDMAN, NEIL H., COBBAN, WILLIAM A. (2003): Ammonites from the Upper Part of the Pierre Shale and Fox Hills Formation of Colorado. American Museum Novitates 3388: 1-46, DOI: 10.1206/0003-0082(2003)388<0001:AFTUPO>2.0.CO;2, URL: http://www.bioone.org/doi/abs/10.1206/0003-0082%282003%29388%3C0001%3AAFTUPO%3E2.0.CO%3B2
64617B3FFF73FFBE1567FA07FE9CFC49.taxon	materials_examined	MATERIAL: CSM 5612 from the Fox Hills Formation near Wellington, Larimer County, Colorado.	en	LANDMAN, NEIL H., COBBAN, WILLIAM A. (2003): Ammonites from the Upper Part of the Pierre Shale and Fox Hills Formation of Colorado. American Museum Novitates 3388: 1-46, DOI: 10.1206/0003-0082(2003)388<0001:AFTUPO>2.0.CO;2, URL: http://www.bioone.org/doi/abs/10.1206/0003-0082%282003%29388%3C0001%3AAFTUPO%3E2.0.CO%3B2
64617B3FFF73FFBE1567FA07FE9CFC49.taxon	description	DESCRIPTION: The specimen is 63 mm long and is embedded in a sandstone block with the dorsum, right side, and part of the venter exposed. No sutures are visible and the specimen is presumably all body chamber. The specimen is slightly crushed and twisted but the original whorl section appears to have been compressed ovoid. Ribs are sharp, straight, and prorsiradiate on the flanks. There are four ribs in a distance equivalent to the whorl height (rib index = 4). Ribs are strong and slightly convex on the venter and weak on the dorsum.	en	LANDMAN, NEIL H., COBBAN, WILLIAM A. (2003): Ammonites from the Upper Part of the Pierre Shale and Fox Hills Formation of Colorado. American Museum Novitates 3388: 1-46, DOI: 10.1206/0003-0082(2003)388<0001:AFTUPO>2.0.CO;2, URL: http://www.bioone.org/doi/abs/10.1206/0003-0082%282003%29388%3C0001%3AAFTUPO%3E2.0.CO%3B2
64617B3FFF73FFBE1567FA07FE9CFC49.taxon	discussion	DISCUSSION: The rib index of this specimen, which equals 4, is higher than that in other specimens of Trachybaculites columna, in which the rib index is 2 or 3 (Cobban and Kennedy, 1995; see especially fig. 13.4 – 6 with a rib index of 3). The lectotype (ANSP 72867 a) and paralectotypes (ANSP 72867 b – f) all have a rib index of 3 (Klinger and Kennedy, 2001: fig. 191). BHI 2035 from the Fox Hills Formation of north­central South Dakota also has a rib index of 3 (Cobban and Kennedy, 1992: 683, fig. 1.7 – 9). Nevertheless, the size of our specimen and its coarse ribbing suggest that it is closely related to Trachybaculites columna. OCCURRENCE: This specimen is from the Fox Hills Formation near Wellington, Colorado. The only recorded specimens of Trachybaculites columna from the Western Interior are from the Hoploscaphites nicolletii and Jeletzkytes nebrascensis zones of the Fox Hills Formation in north­central South Dakota (Cobban and Kennedy, 1992). The species is also reported from the Prairie Bluff Chalk of Alabama and Mississippi (Cobban and Kennedy, 1995), the Corsicana Formation in Guadalupe County, Texas (Stephenson, 1941), and the Garzas Formation in the San Joaquin Valley, California (Matsumoto, 1959).	en	LANDMAN, NEIL H., COBBAN, WILLIAM A. (2003): Ammonites from the Upper Part of the Pierre Shale and Fox Hills Formation of Colorado. American Museum Novitates 3388: 1-46, DOI: 10.1206/0003-0082(2003)388<0001:AFTUPO>2.0.CO;2, URL: http://www.bioone.org/doi/abs/10.1206/0003-0082%282003%29388%3C0001%3AAFTUPO%3E2.0.CO%3B2
64617B3FFF73FFBE1567FA07FE9CFC49.taxon	materials_examined	TYPE SPECIES: Ammonites constrictus J. Sowerby, 1817: 189, pl. A, fig. 1, by original designation.	en	LANDMAN, NEIL H., COBBAN, WILLIAM A. (2003): Ammonites from the Upper Part of the Pierre Shale and Fox Hills Formation of Colorado. American Museum Novitates 3388: 1-46, DOI: 10.1206/0003-0082(2003)388<0001:AFTUPO>2.0.CO;2, URL: http://www.bioone.org/doi/abs/10.1206/0003-0082%282003%29388%3C0001%3AAFTUPO%3E2.0.CO%3B2
64617B3FFF5FFF8E1566FCE1FC61FB59.taxon	materials_examined	TYPE SPECIES: Scaphites nodusus Owen, 1852: 481, pl. 18, fig. 4, by original designation.	en	LANDMAN, NEIL H., COBBAN, WILLIAM A. (2003): Ammonites from the Upper Part of the Pierre Shale and Fox Hills Formation of Colorado. American Museum Novitates 3388: 1-46, DOI: 10.1206/0003-0082(2003)388<0001:AFTUPO>2.0.CO;2, URL: http://www.bioone.org/doi/abs/10.1206/0003-0082%282003%29388%3C0001%3AAFTUPO%3E2.0.CO%3B2
64617B3FFF5FFF8E1566FCE1FC61FB59.taxon	materials_examined	TYPE: The holotype is YPM 23175, a macroconch, as originally designated by Landman and Waage, 1993: 184, fig. 141 A – E, from a bluff­forming bioturbated sandstone in the lower Fox Hills Formation, SE ¼, SW ¼ to SE ¼, SE ¼ sec. 18, T 37 N, R 62 W, Niobrara County, Wyoming. MATERIAL: There are six microconchs: USNM 519513 from the Fox Hills Formation, NE ¼, SW ¼ sec. 2, T 9 S, R 76 W, Park County, Colorado; USNM 519514 from the Fox Hills Formation near Round Butte, Larimer County, Colorado (fig. 1, loc. 6); USNM 519512 from the Fox Hills Formation just south of the Wyoming border and east of Round Butte, Larimer County, Colorado (fig. 1, loc. 9); USNM 519515 from the Fox Hills Formation, center sec. 31, T 6 N, R 58 W, Morgan County, Colorado (fig. 1, loc. 8); CSM 7797 from the Fox Hills Formation, 4 mi (6.4 km) north and 7 mi (11.3 km) east of Fort Collins, Larimer County, Colorado (fig. 1, loc. 1); and USNM 519516 from near the top of the Pierre Shale or lower part of the Fox Hills Formation, SW ¼, SE ¼ sec. 35, T 6 N, R 67 W, Weld County, Colorado (fig. 1, loc. 20). There are also four specimens too fragmentary to determine the dimorph: CSM 7799 from the Fox Hills Formation, 11 mi (17.7 km) north of Wellington, Larimer County, Colorado (fig. 1, loc. 3); AMNH 47399 from the upper transition member of the Pierre Shale, sec. 11, T 4 N, R 70 W, Jefferson County, Colorado (fig. 1, loc. 22); AMNH 47400 from the Fox Hills Formation, SW ¼, NE ¼ sec. 31, T 6 N, R 58 W, Morgan County, Colorado (fig. 1, loc. 23); and AMNH 47398 from the Milliken Sandstone Member of the Fox Hills Formation, SE ¼, NE ¼ sec. 7, T 2 N, R 68 W, Boulder County, Colorado (fig. 1, loc. 24). MICROCONCH DESCRIPTION: USNM 519512 is an internal mold with part of the phragmocone and aperture missing (fig. 23 E – G). The base of the body chamber is not apparent. The umbilical shoulder of the shaft of the body chamber is curved in side view. The cross section at midshaft is subquadrate to trapezoidal with maximum width at the umbilical shoulder in both costal and intercostal section. The umbilical wall is broad and inclined outward and the umbilical shoulder is sharply rounded. The flanks are nearly flat and converge toward the venter. The ventrolateral shoulder is sharply rounded and the venter is very broadly rounded to flat. The specimen is characterized by coarse ribbing and large umbilicolateral and ventrolateral tubercles, in addition to small flank tubercles on the adoral part of the phragmocone. Ribs on the phragmocone are coarse and widely spaced. Near the adoral end of the phragmocone, they swing slightly backward across the umbilical wall and shoulder, then forward, increasing in strength and crossing the flanks with a weak convexity. They bifurcate or intercalate at midwhorl height. Ribs are broad and weak on the venter, which they cross with a very slight adoral projection. There are 5 ribs / cm on the venter at the adoral end of the phragmocone / adapical end of the body chamber. Ribs are barlike on the umbilical wall of the shaft. They are weakly convex on the flanks with broad interspaces between them; the distance between successive rib crests at midflank is 3 – 4 mm. The venter is smooth but undulose, with swellings joining pairs of ventrolateral clavi on either side of the venter. Primary ribs swell into fairly massive umbilicolateral clavi, which are especially noticeable on the right side, where there are four of them. The two most adoral clavi are spaced approximately 9 mm apart. Ventrolateral tubercles are also very prominent and are projected outward and backward and become more widely spaced and larger toward the adoral end of the specimen. They are spaced at distances of 3 – 5 mm on the adapical end of the specimen and 9 mm on the adoral end. The tubercles are clavate in shape with steep adapical sides and more gently sloping adoral sides. Tubercles are generally paired across the venter. Two short rows of flank tubercles occur on the adapical end of the specimen. On the left side, there are two pairs of tubercles, one pair on each of two ribs; on the right side, there is a pair of tubercles on one rib and single tubercles on each of two ribs. USNM 519513 is a microconch still embedded in the matrix with most of the phragmocone missing (fig. 23 O, P). It is an internal mold 53.8 mm in maximum length. The umbilical shoulder is curved in side view and follows the curvature of the venter. The whorl section at midshaft is compressed subquadrate with maximum width at the umbilical shoulder in costal section and at onethird whorl height in intercostal section. The umbilical wall is broad and inclined outward and the umbilical shoulder is sharply round­ ed. Flanks are very broadly rounded, and the ventrolateral shoulder is sharply rounded. The venter is very broadly rounded to nearly flat. As in other microconchs of Jelezkytes dorfi, this specimen is characterized by coarse ribbing, prominent umbilicolateral and ven­ trolateral clavi, and partial rows of flank tubercles on the adoral portion of the phragmocone. Ribs are strong, prorsiradiate, and straight on the preserved part of the phragmocone, with intercalation at one­third whorl height. Several ribs bear one or two small flank tubercles, and all ribs, at least those preserved, bear ventrolateral tubercles. The ribs cross the venter with a weak adoral projection, and there are 7 to 8 ribs / cm on the venter on the adoral part of the phragmocone. Primary ribs are straight, prorsiradiate, and barlike on the umbilical wall of the shaft. They merge into prominent umbilicolateral clavi that are fairly uniformly spaced at distances of 4 – 5 mm. One clavus clearly shows a steep, concave adapical side and more gradually sloping adoral side. Two prorsiradiate ribs branch from each clavus, the more adoral one of which is more prorsiradiate and convex. These ribs are separated by broad interspaces. Branching and intercalation occur on the outer one­third of the flanks, especially on the adoral part of the shaft and hook. As a consequence, the ribbing is dens­ er on the ventrad part of the shell. Large clavi occur on the ventrolateral margin. They increase in size adorally, reaching their largest size (3.5 mm in height) at midshaft, after which they diminish in size. They also gradually become more widely spaced adorally; the distance between successive clavi at midshaft is 9 – 10 mm. The clavi are sharp and projected backward and outward. Each shows a steep adapical side and more gently sloping adoral side. Two clavi show small grooves along their midlines. There are no ribs on the venter but it is slightly undulose, with swellings joining pairs of ventrolateral clavi on either side of the venter. USNM 519514 is an impression of a microconch in a chunk of sandstone (fig. 23 N). The specimen is approximately 56 mm in maximum length. Like the other microconchs, it is characterized by coarse ribbing and prominent umbilicolateral and ventrolateral tubercles / clavi, in addition to a partial row of flank tubercles on what is presumably the adoral part of the phragmocone. Ribs are widely spaced and rectiradiate or prorsiradiate on the midshaft. Ribs become more closely spaced and prorsiradiate on the adoral part of the shaft and hook. Intercalation and branching occur on the outer one­third of the flanks on the midshaft and nearer the middle of the flanks on the hook. Approximately 9 ribs / cm are present on the flanks on the adoral part of the shaft. Eight more or less evenly spaced umbilicolateral tubercles occur at distances of 5 – 6 mm; they attain their maximum height at midshaft. Ventrolateral clavi are also approximately evenly spaced on the shaft at distances of 7 mm. They disappear abruptly (or diminish to a tiny tubercle) at the adoral end of the shaft.	en	LANDMAN, NEIL H., COBBAN, WILLIAM A. (2003): Ammonites from the Upper Part of the Pierre Shale and Fox Hills Formation of Colorado. American Museum Novitates 3388: 1-46, DOI: 10.1206/0003-0082(2003)388<0001:AFTUPO>2.0.CO;2, URL: http://www.bioone.org/doi/abs/10.1206/0003-0082%282003%29388%3C0001%3AAFTUPO%3E2.0.CO%3B2
64617B3FFF5FFF8E1566FCE1FC61FB59.taxon	description	USNM 519515 is a small body chamber fragment, mostly an internal mold, part of which is worn away (fig. 23 A – D). The umbilical shoulder is curved in side view. The apertural margin is slightly flexuous with a weak adoral projection at the venter; the dorsal lappet is not preserved. The whorl section at midshaft is subquadrate. The umbilical wall is broad and slanted outward and the umbilical shoulder is sharply rounded. Flanks are very broadly rounded with maximum width at the umbilicolateral tubercles in costal section and at one­third whorl height in intercostal section. Flanks gradually converge toward the venter. The ventrolateral shoulder curves gently into a moderately well­rounded venter. The ratio of whorl width to whorl height in intercostal section at midshaft is 0.83. The aperture is more ovoid in cross section, with an intercostal ratio of whorl width to whorl height of 0.91. The body chamber is covered with ribs and umbilicolateral tubercles. Ribs on the shaft are broad and slightly prorsiradiate with wide interspaces between them, becoming more prorsiradiate and closely spaced on the hook. Intercalation and branching occur on the middle and outer flanks. Ribs cross the venter with a moderately strong adoral projection; there are 10 ribs / cm on the venter of the hook. The body chamber bears five umbilicolateral tubercles, which are sites of branching and intercalation. These tubercles occur at equal distances of approximately 5 mm. Ventrolateral tubercles are worn off but there are still swellings on the shaft. CSM 7797 is a small slightly distorted microconch with half of the phragmocone missing (fig. 23 H – J). It is approximately 47.4 mm in maximum length and is elongate in outline with only a slight gap between the hook and phragmocone. The umbilicus is large, 3.9 mm in diameter, and the umbilical shoulder is curved in side view. The aperture is slightly flexuous with part of the dorsal lappet exposed. The right side of the midshaft is inflated, possibly due to a healed injury. The whorl section at midshaft, based on the left side of the specimen, is nearly quadrate, with maximum width at the umbilical shoulder in costal section and at one­third whorl height in intercostal section. The umbilical wall is broad, convex, and inclined outward. The umbilical shoulder is sharply rounded and the flanks are broadly rounded, converging toward the venter. The ventrolateral shoulder is sharply rounded and the venter is very broadly rounded. The ratio of whorl width to whorl height at mid­shaft is approximately 0.76. Ribs on the adapical part of the phragmocone are coarse and widely spaced. They are equally widely spaced on the middle of the shaft, but become more closely spaced and prorsiradiate on the adoral part of the shaft and hook, with intercalation and branching occurring on the middle and outer flanks. Ribs cross the venter with a weak adoral projection; there are 9 ribs / cm on the venter of the hook. Six umbilicolateral tubercles are perched on the umbilical shoul­ der. They are spaced at equal distances of approximately 5 mm at midshaft. There are nine ventrolateral tubercles on the body chamber, which are more or less evenly spaced at distances of 6 – 8 mm. The largest and most clavate tubercles occur at midshaft.	en	LANDMAN, NEIL H., COBBAN, WILLIAM A. (2003): Ammonites from the Upper Part of the Pierre Shale and Fox Hills Formation of Colorado. American Museum Novitates 3388: 1-46, DOI: 10.1206/0003-0082(2003)388<0001:AFTUPO>2.0.CO;2, URL: http://www.bioone.org/doi/abs/10.1206/0003-0082%282003%29388%3C0001%3AAFTUPO%3E2.0.CO%3B2
64617B3FFF5FFF8E1566FCE1FC61FB59.taxon	discussion	DISCUSSION: Jeletzkytes dorfi is characterized by moderately widely spaced ribbing, which becomes more closely spaced on the hook, umbilicolateral and ventrolateral tu­ bercles / clavi, and partial rows of flank tubercles on the adoral part of the phragmocone. These features are well illustrated in specimens from Niobrara County, Wyoming (fig. 20 A – D; Landman and Waage, 1993: figs. 141 – 146). The specimens in our collection match those from Wyoming with two exceptions. USNM 519515 lacks ventrolateral tubercles. However, this is a worn specimen and the tubercles have probably eroded away. CSM 7797 is a very small specimen with an estimated maximum length of 47.4 mm. However, it is only slightly smaller than the smallest specimen from Wyoming (48.9 mm) recorded by Landman and Waage (1993: 192). OCCURRENCE: AMNH 47400 occurs at the same locality as YPM 202272, a small belemnite. USNM 519516 is in the same lot as USNM 519510 and 519519, both specimens of Sphenodiscus pleurisepta. Jeletzkytes dorfi occurs in the upper part of the Pierre Shale and Fox Hills Formation in Larimer, Weld, Morgan, Park, Boulder, and Jefferson counties, Colorado, and in the Fox Hills Formation in Niobrara County, Wyoming (Landman and Waage, 1993). It occurs in the Hoploscaphites birkelundae Zone and is commonly associated with the ammonites Hoploscaphites birkelundae, Coahuilites sheltoni, and Sphenodiscus pleurisepta. Jeletzkytes dorfi has also been reported from the lower upper Maastrichtian of Belgium (Jagt and Kennedy, 1994).	en	LANDMAN, NEIL H., COBBAN, WILLIAM A. (2003): Ammonites from the Upper Part of the Pierre Shale and Fox Hills Formation of Colorado. American Museum Novitates 3388: 1-46, DOI: 10.1206/0003-0082(2003)388<0001:AFTUPO>2.0.CO;2, URL: http://www.bioone.org/doi/abs/10.1206/0003-0082%282003%29388%3C0001%3AAFTUPO%3E2.0.CO%3B2
