PLATE XCIII. 



PAGE 



Figs. 1-3. Ceassatellites marylandicus (Conrad) 347 



1. Exterior of left valve. Dover Bridge. 



2. Exterior of left valve of young individual. 



3. Interior of left valve. Same locality. 



Figs. 4-6. AsTARTE cuNEiFORMis Conrad 353 



4. Exterior of right valve. Plum Point. 



5. Exterior of right valve. Same locality. 



6. Interior of left valve. Same locality. 



Figs. 7-9. AsTARTE CASTRANA n. sp 353 



7. Interior of right valve. Reed's. 



8. Exterior of right valve. Same locality. 



9. Exterior of left valve. Same locality. 



Figs. 10, 11. AsTARTE viciNA Say 350 



10. Exterior of right valve. Plum Point. 



11. Interior of left valve. Same locality. 



