PLATE L\l. 



PAGU 



Figs. 1-4. Leda impeoceka (Conrad) 199 



1. Exterior of rigM valve. Popes Creek. 



2. Interior of right valve. Woodstock. 



3. Interior of right valve. Popes Creek. 



4. Exterior of right valve. Popes Creek. 



Figs. 5, 6, 7, 7a. Leda parva (Rogers) ■. 197 



5. Dorsal asj)ect of individnal. Woodstock. 



6. Exterior of right valve. Woodstock. 



7. Interior of left valve. Woodstock. 

 7a. Exterior of same specimen. 



Figs. 8, 8a. Leda cultelliformis (Rogers) 198 



8. Exterior of right valve. Woodstock. 

 8a. Interior of right valve. Woodstock. 



Figs. 9, 10. Leda potomacejvsis n. si3 200 



9. Exterior of right valve. Port Royal, Va. 

 10. Exterior of left valve of j^onng' individual. Popes Creek. 



Fig. 11. Leda cltftonensis n. sp 20] 



Exterior of right valve. 2 miles below Potomac Creek. 



308 



