PLATE XCI. 
PAGE 
Figs. 1-3. Chama congregata Conrad 342 
1. Interior of left valve. Church Hill. 
2. Exterior of right valve. Same locality. 
3. Exterior of right valve. Same locality. 
Figs. 4-6. Cardita peotracta (Conrad ) 343 
4. Exterior of right valve. Governor Run. 
5. Exterior of right valve. Same locality. 
6. Interior of left valve. Same locality. 
Figs. 7-10. Venericardia granulata Say 344 
7. Exterior of right valve, large variety. St. Mary's River. 
8. Interior of left valve. Same locality. 
9. Interior of left valve, smaller variety. Plum Point. 
10. Exterior of right valve, smaller variety. Same locality. 
Figs. 11, 12. Venericardia castrana n. sp 345 
11. Exterior of right valve. Church Hill. 
12. Interior of left valve. Same locality. 
