NORTH AMERICAN CONCHOLOGY. 



329 



81 



81 



81 



81 



81 



81 



81 



81 



SI 



SI 



81 



81 



81 



81 



81 



81 



82 



82 



82 



82 



S2 



S2 



S2 



82 



S2 



82 



S2 



82 



s2 



82 



82 



S2 



82 



82 



82 



82 



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82 



82 



Pupa contracta Say. 



pentodon Bum. 



procera Gould. 



rupicola Say. 

 Vertigo milium Gould. 



ovata Say. 

 Carychium exiguum Gould. 

 Ancylus fuscus Adams. 



rivularis Say. 



tardus Say. 

 Lymnea columella Say. 



desidiosa Say. 



caperata Say. 



macrostoma Say. 



modicellus Say. 



humilis Say. 

 Physa ancillaria Say. 



elongata Say. 



fragilis Migh. <j- Ad. 



heterostropha Say. 

 Planorbis bicarinatus Say. 



deflectus Say. 



exacutus Gould. 



hirsutus Gould. 



parvus Say. 



trivolvis Say. 

 Melania multilineata Say. 



virginica Say. 

 Anculosa carinata Say. 



monodonta Say. 

 Paludina decisa Say. 



subcarinata Say. 

 Amnio o la lapidaria Say. 



decisa Hold. 



porata Say. 



- (n. s.) 



- (n. s.) 



Valvata pupoidea Gould. 

 tricarinata Say. 



