PLATE CVIII. 



PAGE 



Figs. 1, 2. Leda concentrica (Say) 397 



1. Interior of right valve. Pocomoke City Well, 53 to 75 feet from 



surface. 



2. Exterior of right valve. Same locality. 



Figs. 3, 4. YoLDiA L/Evis ( Say) 397 



3. Interior of right valve. Jones Wharf. 



4. Exterior of left valve. Same locality. 



Figs. 5, 6. NucuLA peoxima Say 398 



5. Exterior of right valve. Dover Bridge. 



6. Interior of left valve. Same locality. 



Figs. 7, 8. NucuLA sinaria Dall 399 



7. Interior of left valve. Cove Point. 



8. Exterior of right valve. Same locality. 



Figs. 9-11. NucuLA taphria Dall 400 



9. Interior of right valve. St. Mary's River. 



10. Exterior of right valve from Natural Well, North Carolina. 



U. S. National Museum. (After Dall.) 



11. Exterior of right valve. St. Mary's River. 



Figs. 12-14. NucuLA prunicola Dall 401 



12. Exterior of right valve. Plum Point. 



13. Exterior of right valve. Same locality. U. S. National Museum. 



(After Dall.) 



14. Interior of right valve. Same locality. 



