Notes on the Molliiscan Fauna of NoHhern Illinois. 323 



Mesodon — (Raf) . 



H. albolahris, Say. H. mnltilineata, Say. H. pennsj/lvanica, Green. 



H. exoleta, Binney. H. thyroidns, Say. IT. clausa, Say. H. j)rofunda, 



Say. H. diodonta, Say. The latter has been given me as from 



Illinois ; I have never found it myself. Known as H. Sayii, Binney. 



Stenotrema — (Raf) . 

 H. Jnrsuta, Say. H. monodon, ^ack. H. monodon,var. LeaVi. Ward. 



Strohila — (Moese). 

 H. labyrinthica, Say. Very abundant. 



Genus Pupa — (Drap). 

 Pupilla. 

 P. pentodon, Say. Very abundant. 



Leueocliila. 

 P. fallax, Say. P. armifera, Say. P. corticaria, Say. All abundant. 



Genus Succinea — (Drap). 

 S. ohliqiia, Say. S. avara, Say. S. rettisa, Lea. The latter species 

 is very abundant in the calumet swamps. I believe these are all the 

 species of Succinea that can be found in the northern half of the State. 

 But I have known as many as seven species reported from one county. 

 I have not been there. Nor can I credit any such number as existing 

 in a single small district. 



Limnopliila. 

 Family Auriculidce. — Genus CarycMum — (Muller). 

 C. exiguum, Muller. Very abundant. 



• Family Limnceidce. — Genus Linmcea — (Lam). 



L. refiexa, Say. L. pallida, Ad. L. hitmilis, Say. L. desidiosa, 

 Say. L. caperata, Say. L. j^O'l^siris, Muller. L. sfagnalis, Linn. 

 L. appressa, Say. L. umhrosus, Say. L. zebra, Tryon. L. catas- 

 copium, Say. All abundant. 



Genus Phi/sa. (Drap). 

 P. gyrina. Say. P. liildritliiana. Lea. I think the latter may be 

 retained as a distinct species, though considered by some to be the 

 same as the former. Both are abundant. 



Genus Bulinus — (Ad.) 

 B. liypnorum, Linn. Abundant. 



