THE NAUTILUS. 



115 



■Strepomatid^. 



Goniobasis virginica Gniel. 



CORBICULID.E. 



Sphaerium transversxiin Say. 

 Sphaeriwn striatinnm Lam. 

 Pisidium virginicum Gmel. 



IjNIONIDiE. 



XJnio complanatus Sol. 

 Unio cariosus Say. 

 Uiiio nasutus Say. 

 Anodonta Tryonii Lea. 



