12S 



BIBLIOGRAPIIY OF 



Cyolostoma lapidaria Say. 

 Planorbis armigerus Say. 

 bicarinatus Say. 

 campanulatus Say. 

 deflectus Say. 

 dilatatus Gould. 

 elevatus Adams. 

 exacutus Say. 

 hirsutus Gould. 

 lentus Say. 

 obliquus De Kay. 

 parvus Say. 

 trivolvis Say. 

 Physa aurea Lea = 



heterostropha var. 

 elongata Say. 



J', hypnorum Linn. 

 heterostropha Say. 

 Sayi Tappan = 



ancillaria var. 

 Lymnaea caperata Say. 



L. umbilicata Adams. 

 chalybea Gould. 

 columella Say. 

 decollata Mighels. 

 desidiosa Say. 

 elodes Say. 

 emarginata Say. 

 Linsleyi De Kay. 



(With a description). 

 macrostoma Say. 

 modicellus Say. 



L. humilis Hald. 

 Valvata pupoidea Gould. 

 tricarinata Say. 

 unicarinata De Kay. 

 Paludina decisa Say. 

 integra Say. 



J', microstoma Kirtland. 

 lustrica? Say. 



Amnicola Gould. 

 Amnicola Cincinnatensis 

 grana Say. [Anthony. 



porata Say. 

 pallida Hald. 



