SECTION A.] NORTH AMERICAN CONCIIOLOGY. 



C33 



Page. 



106 Uiiio verrucosus Bar. 



U. tuberculatus Raf. 

 verrucosus pur pure us 

 106 zig-zag Lea. [Hild. 



106 Alasmodonta complanata 



{Bar. 

 106 calceola Lea. 



Margaritana deltoidea 

 106 rugosa Bar. [Lea. 



A. abducta Say. 

 106 Anodonta grandis Say. 



A. corpulenta Cooper. 



Page. 



106 Anodonta plana Lea. 



A. dec.livis Conr. 

 106 Ferussaciana Lea. 



106 exilis Lea. 



A. salmones Lea. 

 106 imbecilis Say. 



A. incerta Lea. 

 106 lata Raf. 



Unto dehiscens Say. 



A. oriens Lea. 



