PLATE LXVII. 



PAGE 



Figs. 1-3. COEBULA iDONEA Conrad 279 



1. Exterior of right valve. Jones Wharf. 



2. Interior of right valve of another specimen. Same locality. 



3. Interior of left valve. Same locality. 



Figs. 4-5. CoEBULA ELEVATA Conrad 280 



4. Interior of right valve. Plum Point. 



5. Exterior of right valve. Same locality. 



Figs. 6-14. CoRBULA iN.-EQUALis Say 281 



6. Exterior of right valve. Church Hill. 



7. Interior of right valve. Plum Point. 



8. Exterior of right valve of large variety. St. Mary's River. 



9. Exterior of valve. Jones Wharf. 



10. Exterior of left valve. Church Hill. 



11. Interior of left valve of coarsely sculptured variety. Plum 



Point. 



12. Exterior of right valve of same individual as shown in Fig. 11. 



13. Exterior of left valve. Jones Wharf. 



14. Exterior of right valve. Oligocene of Oak Grove, Fla. Type 



specimen of C. whitfieldi Dall. (After Dall.) 



Figs. 15-19. CoRBULA cuNEATA Say 282 



15. Interior of left valve. Jones Wharf. 



16. Exterior of left valve. Same locality. 



17. Exterior of right valve. Same locality. 



18. Exterior of right valve. Same locality. 



19. Interior of right valve. Same locality. 



