NORTH AMERICAN CONCHOLOGY. 



219 



Page. 



367 Pupa armifera Sat/. 



367 corticaria Say. 



367 ovata Say. 



P. modes/a. 



3G7 Succinea obliqua Say. 



307 avara Say. 



368 Bulimus lubricus Drug. 

 3GS harpa Pfeiffer. 



Helix harpa Say. 



368 Planorbia armigerus Say. 



368 bicarinatus Say. 



368 campanulatus Say. 



368 corpulentus Say. 



368 deflectus »S'a</. 



36S exacutus Say. 



368 parvus Say. 



36S trivolvis <S'a_y. 



368 Limnea caperata Say. 



L. umhilicata Adams. 



368 catascopium Say. 



Page. 



368 Limnea columella Say. 



L. macrostoma Say. 



368 emarginata Say. 



368 fragilis Linn. 



L. elodes Say. 



368 gracilis Say. 



368 jugularis Say. 



L. stagnalis Kirtland. 



368 megasoma Say. 



368 umbrosa Say. 



368 Physa heterostropha Say. 



368 elongata Say. 



368 Paludina decisa Say. 



368 isogona Say. 



368 subglobosa Say. 



368 Amnicola limosa Say. 



368 lustrica Say. 



368 Melania depygis Say. 



368 elevata Say. 



368 Valvata tricarinata Say. 



368 sincera £03/. 



Okder ACEPHALA. 



Unio nervosus Raf. 



U. zigzag Lea. 



donaciformis Lea. 

 olivarius Raf. 



U. ellipsis Lea. 

 parvus Barnes. 

 prasinus Conrad. 



U. Schoolcraftensis Lea. 

 radiatus Lam. 

 rectus Linn. 



U. prselongus Barnes, 

 reflexus Raf. 



U. cornutus Barnes, 

 subrostratus Raf. 



U. iris Lea. 

 trigonus Lea. 

 truncatus Raf. 



U. elegans Lea. 

 tuberculatus Raf. 



U. verrucosus Barnes. 

 undatus Barnes. 



