EXPLANATION OF PLATES. 433 
FIGURE. PAGE. 
87. Pholadomya (Liopistha) frequens, Zittel. Cret.; Gosau, 152 
88. Cimitaria corrugata, Conr. Hamilton Group, N. Y., . 251 
89-91. Mactra turgida, Gmel. West Indies, . : . 156 
92-94. Mactra (Schizodesma) Spengleri, Linn. Cape of 
Good Hope, : : ; 2 LST 
95. Mactra (Hemimactra) solidissima, Chemn. N. Jersey, 157 
96. Mactra (Hemimactra) triangula, ’Brocchi. Med. Sea, 157 
97. Mactra (Oxyperas) triangularis,Lam. East Indies, . 157 
98-100. Mactra (Mulinea) edulis, King. Sts. of Magellan, 157 
1. Mactra (Mactrinula) plicataria, Linn. Indian Ocean, 157 
2-4. Mactra (Mactrella) alata, Spengler. West Columbia, 157 
5, 6. Mactra (Harvella) elegans,Sowb. Panama, . . 158 
7. Rangia cyrenoides, Desmoul. New Orleans, : . 158 
8. Lutraria oblonga, Gmel. Europe, 3 frp he : . 159 
9. Lutraria (Darina) solenoides, King,  . : , . 159 
PuaTE 110. 
10. Lutraria (Vanganella) lanceolata, Gray. New Zealand, 160 
11. Lutraria (Zenatia) acinacies, Quoy. New Zealand, . 159 
12. Lutraria (Cecella) turgida, Deshayes. Philippines, . 159 
13. Anatinella candida, Chemn. Ceylon, . : - . 160 
14. Anatinella Sibbaldi, Sowb. Japan, . ; : . 160 
15. Cardilia Martinii, Desh. Malacca, . : : . 160 
16. Cardilia semisulcata, Lam. Amboina, 5 : . 160 
17. Cardilia inermis, Desh. Sumatra, : , . 160 
18. Heterocardia cibbosula, Desh. Indian Ocean, : . 160 
19. Pteropsis papyria, Conr. Eocene; Alabama, . . 160 
20. Tresus maximus, Middendorff. California, : GH 
21. Schizotherus Nuttalli, Conrad. California, : = Loe 
22. Mactromeris ovalis, Gould. Massachusetts, : ~ bOT 
23. Standella (Merope) Aigyptica, Chemn. Ceylon, : Tel 
24. Labiosa lineata, Say. South Carolina, ; me yl 
25. Labiosa (Reta) canaliculata, Say. Atlantic Coast of 
the United States, . : : : 3 é > tO 
26. Paphia trigona, Desh, : ; : « B61 
27. Paphia (Mesodesma)| erycina, Lam. Singapore, . 162 
28. Paphia (Taria) lata, Desh. New Zealand, . . 162 
29. Paphia (Ceronia) Jauresii, Joannis. Newfoundland, . 162 
30. Paphia (Donacilla) donacilla, Lam. Mediterranean, . 162 
31. Paphia (Anapa) cuneata, Lam. New Zealand, . . 162 
32. Paphia (Davilla) crassula, Desh., . é ’ : . 162 
33. Ervilia castanea, Mont. England, : : : . 162 
34. Semele variegata, Lam. Brazil, : : . . 163 
35. Semele reticulata, Chemn, West Indies, , : : 16S 
36. Syndosmya alba, Wood, "England, : : . 163 
37. Syndosmya brevi is, Desh. Fossil, Paris Basin, ; . 163 
