PLATE XV, 
Figs. 1, la. PSEUDOMONOTIS PRECURSOR n. sp p. 217 
1. Cardinal view of the type specimen; the valves are separated 
ventrally by the matrix, la. The left valve of the same. 
Brentwood limestone, Station 135. 
Fig. 2. EDMONDIA SUBTRUNCATA Meek p. 208 
2. A left valve preserved as an internal cast. Kessler limestone, 
Station 209. 
Fig. 3. MYALINA CUNEIFORMIS Gurley? p. 220 
3. An internal cast of a left valve referred to this species. Kessler 
limestone, Station 209. 
Fig, 4. MYALINA ORTHONOTA n. sp. p. 221 
4. The left valve selected as the holotype. Hale formation. Station 
136. 
Fig. 5. SPHENOTUS HALENSIS n. sp p. 207 
5. The holotype, a left valve, x2. Hale formation. Station 136. 
Fig. 6. PARALLELODON PERGIBBOSUS n. sp p. 142 
6. The holotype, a right valve. Brentwood limestone. Station 135. 
Fig. 7. PARALLELODON CANCELLOSUS n. sp p. 215 
7. The holotype, a right valve, x2. Brentwood limestone. Station 135. 
Fig. 8. SOLENOMYA sp p. 206 
8. A left valve referred to this genus. Kessler limestone. Station 144. 
Fig. 9. MONOPTERIA ? sp p. 217 
9. A left valve questionably referred to this genus. Hale forma- 
tion, Station 136. 
Fig. 10. EDMONDIA MACCOYII Hind ? p. 209 
10. A left valve preserved as an internal cast. Kessler limestone, 
Station 209. 
Fig. 11. AVICULOPECTEN HERTZERI Meek p. 222 
11. A left valve referred to this species. Kessler limestone. Station 
144. 
Fig. 12. AVICULOPECTEN AURISCULPTUS n. sp p. 224 
12. The holotype, an incomplete left valve. Hale formation. Station 
136. 
Fig. 13. AVICULOPECTEN ARKANSANUS n. sp p. 226 
13. A cast of the holotype, an impression of a left valve, x2. Hale 
formation. Station 136. 
Fig. 14. SCHIZODUS MORROWENSIS n. sp. p. 222 
14. The holotype, a left valve. Hale formation. Station 136. 
Figs. 15, 15a, PSEUDOMONOTIS INFLATA n. sp. p, 218 
15. 15a. Cardinal and lateral views of the holotype, an internal cast 
of a left valve. Kessler limestone, Station 209. 
Fig. 16. AVICULOPECTEN sp p. 227 
16. An internal cast of a right valve. Kessler limestone. Station 209. 
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