404 Eocene Fossils of the United States. 
Catalogue of recent shells, which occur also fossil in the Moons 
deposits in the United States. 
Since I enumerated the proportion of recent species in Miocene 
deposits in the Proceedings of the Academy of Natural Sciences, 
Lhave obtained others and identified some more in my cabinet, 
and every new research i in those beds must bring others to light, 
varying in some slight degree the ae of living and extinct 
species. 
Bivalves. 
1. Artemis acetabulum, Con. Florida. 
2. A. elegans, Con. Florida. 
3. Astarte lunulata, Con, Charleston. 
4. Arca improcera, Con. _ Southern coast. 
5. po 2 aie 
6. “i Say. a coast. 
7. Canta wi tridentata, Say. Southern coast. 
9. : Chips iedinalla, Lam. Southern coast. | 
10. -Cumingia tellinoides, Con. Southern coast, Massachusetts. 
11. Cultellus caribeus. Southern coast, Massachusetts, New 
Jersey. 
12. Cytherea elevata, Con. Gulf of Mexico. 
13. C. Sayana, Con. Rhode Island, Massachusetts, New Jersey. 
14. Laucina crenulata, Con. Cape Henry, Virginia. : 
15. L. divaricata, Lam. Atlantic coast. a. 
16. L. jamaicensis, Lam. West Indies. 
17. L. trisulcata, Con. Florida. 
18. L. radula, Lam. Rhode Island, Massachusetts. 
19. L. squamosa, Lam. Southern coast. 4 
20. Mactra lateralis, Say. Atlantic coast. 
21. Nucula acuta, Con. Florida. 
22. N. proxima, Say. Atlantic coast. 4 
23. N. limatula, Say. Massachusetts. 
24. N. acuta, Con. Gulf of Mexico. 
25. Pecten concentricus, Say. Atlantic coast. 
26. Tellina lusoria, Say. Southern coast. 
27. Venus cancellata, Lam. Southern coast. 
28. V. mercenaria, Lin. Atlantic coast. 
29. V. metastriata. Florida. 
