PLATE LXXXVIII. 



PAGE 



Figs. 1-3. Erycina marylandica n. sp 328 



1. Exterior of left valve. Three miles south of Chesapeake Beach. 



2. Interior of right valve. Same locality. 



3. Interior of right valve. Plum Point. U. S. National Museum. 



(After Ball.) 



Figs. 4a, 4b. Erycina rickardia n. sp 328 



4a. Interior of right valve. Plum Point. 

 4b. Exterior of same valve. 



Fig. 5. Erycina speciosa n. sp 329 



5. Interior of right valve. Plum Point. 



Figs. 6-8. BoRNiA MACTROiDES (Courad) 330 



6. Interior of left valve. Dover Bridge. 



7. Exterior of right valve. Same locality. 



8. Interior of right valve. Same locality. 



Figs. 9a, 9b. Bornia Triangula Dall 330 



9a. Interior of right valve. Three miles west of Centerville. 

 9b. Exterior of same valve. 



Fig. 10. BoRNiA marylandica n. sp 330 



10. Interior of right valve. Greensboro. 



Fig. 11. Bornia depressa n. sp 331 



11. Interior of right valve. Plum Point. 



Figs. 12, 13. Kellia rotundula n. sp 331 



12. Interior of right valve. Governor's Run. 



13. Interior of left valve. Same locality. 



Figs. 14-18. Thecodonta (Dicranodesma) calvertensis n. sp 332 



14. Interior of right valve. Plum Point. 



15. Interior of left valve. Same locality. 



16. Exterior of left valve. Same locality. 



17. Interior of left valve. Plum Point. U. S. National Museum. 



(After Dall.) 



18. Interior of right valve. Plum Point. U. S. National Museum. 



(After Dall.) 



Fig. 19. MONTACUTA MARIANA Dall 332 



19. Interior of right valve. St. Mary's River or Plum Point. U. S. 



National Museum. (After Dall.) 



Figs. 20, 21. Aligena ^quata (Conrad) 333 



20. Exterior of left valve. Jones Wharf. 



21. Exterior of right valve. Same locality. 



