619 



Helix monodon Rack. 

 IT. fraterna Say. 



hirsuta Say. 



II. fraterna Wood. 



pulchella Mull. 

 II. minuta Say. 



striatella Anth. 



thyroidus Say. 



tridentata Say. 

 Pupa contracta Say. 



curvidens Gould. 



exigua Say. 



fallax Say, 



milium Gould. 



modesta Say. 



simplex Gould. 



Tappauiana Ward. 

 Bulimus lubricus Briuj. 

 Succinea avara Say. 



campestris Say. 



ovalis Say. 

 Auricula bidentata Gould. 

 Melampus bidentatus 



Say. 



denticulata Gould. 

 Planorbis armigerus Say. 



bicarinatus Say. 



campanulatus Say. 



deflectus S<ty. 



dilatatus Gould. 



elevatus Ad. 



exacutus Say. 



hirsutus Gould. 



lentus Sap ■ 



parvus Say. 



trivolvis Say. 



virens. 

 Physa ancillaria Say. 



elongata Say. 



heterostropha Say. 

 Limneea columella Say. 



chalybea (var.) Gould. 



catascopium Say. 



elodes Say. 



desidiosus Say. 



