PLATE CVIII. 
PAGE 
Figs. 1, 2. Leda concenteica (Say) 397 
1. Interior of right valve. Pocomoke City Well, 53 to 75 feet from 
surface. 
2. Exterior of right valve. Same locality. 
Pigs. 3, 4. YoLDiA LEVIS ( Say) 397 
3. Interior of right valve. Jones Wharf. 
4. Exterior of left valve. Same locality. 
Figs. 5, 6. NucDLA PROXiMA Say 398 
5. Exterior of right valve. Dover Bridge. 
6. Interior of left valve. Same locality. 
Figs. 7, 8. NuciJLA 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. 
