PLATE LXV. 



PAGE 



Figs. 1-4. Nuctjla peoxima Say 207 



1. Interior of left valve. Wailes Bluff. X 6 



2. Exterior of right valve. Same locality. X 6 



3. Interior of same. 



4. Exterior of left valve. 



Figs. 5-8. Leda acuta (Conrad) 208 



5. Interior of left valve. Wailes Bluff. X 5 



6. Exterior of right valve. Same locality. X 5 



7. Interior of same. 



8. Exterior of left valve. 



Figs. 9-12. Yoldia limatula ( Say) 209 



9. Interior of left valve. Wailes Bluff. X 2 



10. Exterior of right valve. 



11. Interior of right valve. Same locality. X 2 



12. Exterior of left valve. 



