Geological Papers. 109 



EXPLANATION OF PLATES. 



Leda fossa (Baird). 



la. Right valve, 1-1. 

 16. Left valve, 1-2. 



Leda hamata (Carpenter). 

 2a. Left valve, 1-1. 

 26. Right valve, 1-2. 



Leda tenuisulcata (Stimp.) 

 3. Left valve, 1-1. 



Pecten (Chlamys) jordani (Arnold). 

 4a. Left valve, 1-2. 



Pecten rubidos (Hds.) (?). 

 5a. Left valve, 1-2. 

 56. Right valve of old specimen, 1-2. 



5c. An enlarged double rib of 56, showing lines of growth, magni- 

 fied. 



Septifer bifercatus (?). 



6. Part of left valve, 1-1. 



Tapes staminea (Conrad) . 



7. Left valve, 1-1. 



Cardium nuttaUii (Mart.) 

 8a. Right valve, 1-2. 

 86. Inside of right valve, 1-2. 



(?) Abra (?). 



9a. Left valve, 1-1. 



Macoma nasuta (Conrad) . 

 10a. Right valve, 1-1. 

 106. Inside of left valve, 1-2. 



Macoma indentata (Carpenter) (?). 



11. Right valve, 1-1. 



Macoma inquinata (Deshayes). 



12. A much broken left valve, 1-1. 



Macoma concentrica (Burg.) 



13. Broken right valve, 1-2. 



Macoma tampaensis (Conrad) (?). 



14. Left valve, 1-1. 



Macoma yaldiformis (?). 



15. Broken left valve, 1-1. 



Saxicava rugosa (Linn.) 



16. Right valve, 1-1. 



Natica (Cryptonatica) clausa (Broderip and Sowerby). 



17. Drawing showing aperture, 1-1. 



Vermetes species. 



18. Drawing, 1-1. 



Ocinebra interfossa (Cpr.) 



19. Drawing showing aperture, 1-1. 



