MOLLUSCA OF OHIO. 395 



Anodonta imbecillis Say. 



Over the state, common, in all kinds of waters. The animal 



is hermaphrodite. 

 Of the following three species, of the St. Lawrence drainage, 



I have seen no specimens: 



Anodonta implicata Say. X 



Anodonta pepiniana Lea. X 



Anodonta kennicottii Lea. X 



SPH^RIID.-E. 



Sphaerium simile (Say, Cyclas) , Cyclas sulcataLamarck,Sph<rriiun 



• • sulcatum Prime, Mon. Corb. 



• • Over the state, in various kinds of waters. 

 Sphaerium striatinum (Lamarck, Cyclas). 



Over the state; very variable in size, shape, striation, color, 

 etc. Some Sphaeria provisorily ranged under striatinum, 

 may prove distinct species, e. g. a form from Geauga 

 Co. (Streator), seems identical with a Potomac River 

 Sphaerium. 

 Sphaerium solidulum (Prime, Cyclas). 



Over the state, variable. The typical form, as it seems, 

 especially in the western part of the state. 

 Sphaerium stamineum (Conrad, Cyclas). 



Over the state, very variable, and there are, probably, a 

 number of varieties. 

 tSphaerium flavum (Prime, Cyclas). X 



Lake Erie (St.), and probably some of its tributaries. 

 Sphaerium fabale (Prime, Cyclas). 



Hamilton Co. (Walker; the species is in none of the Cincin- 

 nati lists) ; Portage Co. (Streator, St,) ; Summit and 

 Stark Counties (St.). Probably over most of the state. 

 Sphaerium rhomboideum (Say, Cyclas). 



Portage Co.! (Streator); Summit, Stark and Tuscarawas 

 Counties (St.); Columbus; Cincinnati. 

 Sphaerium occidentale Prime. 



Over the state, common in quiet waters, ponds, ditches, 

 swamps. 

 Sphaerium occidentale amphibium Sterki. 



Living on damp ground, under dead leaves, etc. ; smaller 

 than the typical form, and of somewhat different shape 

 and appearance. Garrettsville ! (Streator) ; Tuscarawas 

 Co., various places (St.). 

 Musculium transversum (Say, Cyclas), Sphcvriuni, Calyculina 

 transversa. 

 Over the state, common in all kinds of waters, even in rivers 

 with rocky bottom, e. g. the Sandusky at Tiffin (St.). 

 Musculium contractum? (Prime, Sphaerium), was seen 

 among a mixed lot supposed to be from Ohio (Cincin- 

 nati museum). 



