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 kennicottiu Lea. x 
SPHERIIDA. 
Spherium simile (Say, Cyclas), Cyclas sulcata Lamarck, Spherium 
sulcatum Prime, Mon. Corb. 
Over the state, in various kinds of waters. 
Spherium striatinum (Lamarck, Cyclas). 
Over the state; very variable in size, shape, striation, color, 
etc. Some Spheria provisorily ranged under striatinum, 
may prove distinct species, e. g. a form from Geauga 
Co. (Streator), seems identical with a Potomac River 
Spherium. 
Spherium solidulum (Prime, Cyclas). 
Over the state, variable. The typical form, as it seems, 
especially in the western part of the state. 
Spherium stamineum (Conrad, Cyclas). 
Over the state, very variable, and there are, probably, a 
number of varieties. 
*Spherium flavum (Prime, Cyclas). 
Lake Erie (St.), and probably some of its tributaries. 
Spherium 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. 
Spherium rhomboideum (Say, Cyclas). 
Portage Co.! (Streator); Summit, Stark and Tuscarawas 
Counties (St.); Columbus; Cincinnati. 
Spherium occidentale Prime. 
Over the state, common in quiet waters, ponds, ditches, 
swamps. 
Spherium 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), Spherium, 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, Spherium), was seen 
among a mixed lot supposed to be from Ohio (Cincin- 
nati museum). 
