384 OHIO STATE ACADEMY OF SCIENCE. 



Ancylus tardus Say. 



Cincinnati; Tuscarawas Co. (St.). Probably over the state. 

 Ancylus rivularis Say. 



Cincinnati; Cuyahoga River (Allen); Tuscarawas Co. (St.). 

 fAncylus sterkii Walker, MS. 



Tuscarawas River, common; Maumee River (St.). [Shell 

 rather small, slender, with the apex decidedly posterior, 

 near the right margin, and markedly oblique.] 

 Ancylus shimeki Pilsbry. X 



Tuscarawas Co. (St.). 

 fAncylus pumilus Sterki. 



Tuscarawas River (types), Miami Canal at Hamilton (St.). 



fGundlachia ? meekiana Stimpson. X 



Pools near New Philadelphia (St.). Thornburg, Cuyahoga 

 Co., on Nuphar leaves in a slough on the Cuyahoga 

 River (Allen), may be of another species. 

 fGundlachia ? sp. X 



Tuscarawas Rixer at New Philadelphia (St.). [The same has 

 been seen from Indiana; very small, 2 mill, long, and of 

 a shape quite different from other Gundalchia; may 

 represent a distinct genus.] 



PROSOBRANCHIATA. 



HELICINID^. 



Helicina occulta (Say, Helix), has been cited, but I have seen 

 no specimens. 



VIVIPARID.E. 



Campeloma ponderosum (Say, Paludina). 



Ohio River. 

 Campeloma subsolidum (Anthony, Paludina.) 



"Ohio, northern part;" Ohio Canal near Cleveland (Allen). 

 Campeloma integrum (Say, Paludina). 



Over the state, common. Regarded as a variety of decisum, 

 by some conchologists. 

 Campeloma integrum obesum Lewis. 



Cincinnati; Miami Canal at Middletown, Ohio Canal at 

 Columbus; Hudson, Summit Co. (Walker). 

 Campeloma decisum (Say, Lymnaea, Paludina). 



Lake Erie and tributaries; Mahoning River, Miami River, 

 Miami Canal (Walker). 

 Campeloma decisum fecundum Lewis. 



Ohio Canal at Columbus, Miami Canal at Cincinnati (Walker) 



