MOLLUSCA OF OHIO. 381 



BRANCHIOPNEUSTA. 



AURICULID^E. 



Carychium exiguum (Say, Pupa). 



Over the state, common and variable. 

 f Carychium exile H. C. Lea. 



Over the state ; seems to be more on elevated and dry places 

 than exiguum, although the two are found associated. 



PHYSID^E. 



Physa ancillaria Say. X 



Summit Co. 

 tPhysa ancillaria magnalacustris Walker. 



Lake Erie (St.,), t. Walker. 

 Physa sayi Tappan. 



Meyer's Lake, Canton (St.); "Pippin Lake, Portage Co.," 

 from where the species was originally described. 

 Physa heterostropha Say. 



Cincinnati; Cleveland (Allen); Tuscarawas Co. (St.); prob- 

 ably over the state. 

 Physa gyrina Say. 



Over the state, common and very variable. 

 Physa gyrina elliptica Lea. 



Tuscarawas and Medina Counties (St.). 

 Physa gyrina hildrethiana Lea. 



La Grange, Lorain Co. (Walker). 

 Physa integra Say. 



Over the state, preferably in rivers and creeks. 

 Physa anatina Lea. 



Tuscarawas river, and Nimishillen Creek, at Canton (St., 

 t. Walker). May be a variety of integra. 

 tPhysa aplectoides Sterki. X 



Portage Co.! (Streator) ; Tuscarawas Co. (St.). Very small 

 and slender; distinct, t. Walker. 

 Aplexa hypnorum (Linnee, Bulla). 



Over the state; at some places out of water, on damp 

 ground, e. g. Tuscarawas Co. (St.). 



LYMN^EID^E. 



Lymnaea stagnalis Linne. Pal. 



Kent, Portage Co. (Dean). 

 tLymnaea megasoma Say. X 



Mahoning River at Alliance (St.) 

 Lymnaea palustris Muller, elodes Say. Pal. 



Over the state. 



