EXPLANATION OF PLATE VIIL 



Fig. 1 7 A. — hampsilis a^iodojitoides (Lea), cf — Extenal view of right 

 valve. {% Nat. size). 



Fig. 17B. — L. anodontoides. cf — Internal view of left valve. 



Fig. 18A. — Lampsilis fallaciosa (Smith) Simpson. 9 — External view 

 of right valve. (i^4 Nat. size). 



Fig. 18B. — L. fallaciosa. 9 — Dorsal view showing Lampsiline beak 

 sculpture. 



