Fig. 17. AVICULOPECTEN HALENSIS n. sp p. 223 
17. A cast of one of the cotypes, an external mold of a left valve, x2. 
Hale formation. Station 136. 
Fig. 18. PALEOLIMA INEQUICOSTATA n. sp p. 229 
18. The holotype, an incomplete left valve. Kessler limestone, Sta- 
tion 209. 
Fig. 19. LEDA BELLISTRIATA Stevens ? p. 212 
19. An incomplete left valve. Hale formation. Station 136. 
Fig. 20. CYPRICARDINIA LAEVICULA n. sp p. 216 
20. The holotype, a left valve. Brentwood limestone. Station 135. 
Fig. 21. NUCULA PARVA McChesney p. 210 
21. A typical right valve, x2. Hale formation, Station 137. 
Figs. 22, 22a. NUCULA KESSLERIANA n. sp p. 211 
22. The holotype, a right valve. 22a. Cardinal view of the same. 
Kessler limestone, Station 209. 
Figs. 23, 23a. STROPHOSTYLUS SUBOVATUS (Worthen) ? p. 238 
23. 23a. Two views of a specimen thus identified. Hale formation. 
Station 136. 
Fig. 24. EUOMPHALUS CATILLOIDES (Conrad) p. 236 
24. A typical specimen. Morrow formation. Station 301. 
Fig. 25. EUCONOSPIRA ARKANSANA n. sp p. 235 
25. One of the cotypes, x2. Brentwood limestone. Station 134. 
Fig. 26. SPHAERODOMA sp p. 241 
26. An exfoliated specimen referred to this genus. Brentwood lime- 
stone, Station 135. 
Fig, 27, WORTHENIA TABULATA (Conrad) p. 234 
27. A cast of a shell incompletely preserved as an external mold. 
Kessler limestone, Station 209. 
Fig. 28. PLATYCERAS PARVUM (Swallow) p. 238 
28. A nearly complete specimen. Brentwood limestone. Station 135. 
PLATE XVI. 
Figs. 1, 2. ACLISINA ? sp p. 240 
1. An internal cast of a shell questionably referred to this genus. 
2. A turreted gastropod probably conspecific with the first. 
Hale formation. Station 136. 
Figs. 3, 3a. BELLEROPHON CRASSUS var. WEWOKANUS 
Girty .p. 232 
3, 3a. Two views of a large individual belonging to this variety. 
Brentwood limestone. Station 134. 
Figs. 4, 4a. BELLEROPHON cf. SUBLAEVIS Hall..-. p. 232 
4, 4a. Two views of one of the shells thus identified, x2, Brentwood 
limestone. Station 135. 
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