MOLLUSCA OF OHIO, 383 
Planorbis trivolvis lentus Say. 
Cincinanti; Columbus (Walker). 
Planorbis campanulatus Say. 
Summit, Stark and Tuscarawas Counties (St.). 
Planorbis bicarinatus Say. 
Over the state, common. 
Planorbis dilatatus Gould. 
Over the state. 
{Planorbis dilatatus buchanensis Lea (t. Walker). 
New Philadelphia (St.). 
{Planorbis opercularis multilineatus Vanatta, opercularis orego- 
nensis Vanatta. X 
Geauga Lake, east of Cleveland (Allen, t. Vanatta). 
Planorbis excacuous Say, exacutus. 
Over the state. 
tPlanorbis rubellus Sterki, exacutus var. rubellus. 
Portage Co.! (Streator); Summit, Stark and Tuscarawas 
Counties (St.). 
7Planorbis umbilicatellus Cockerell. 
Summit and Tuscarawas Counties (St.). 
Planorbis deflectus Say. 
Garretssville, Portage Co. (Streator, t. Walker) ; Tuscarawas 
Co. (St.). This needs careful revision, since specimens 
of several other species have been identified as deflectus. 
Planorbis albus Muller, dirsutus Gould. Pal. 
Stark and Tuscarawas Counties (St.); probably over the 
state. 
Planorbis parvus Say. 
Over the state, common and variable. 
{Planorbis circumlineatus Tryon. 
Summit and Tuscarawas Counties (St.). Some conchologists 
regard it as a variety of parvus; so far as my materials 
show, 1t appears to be distinct; at any rate not simply 
a synonym of parvus. 
Segmentina armigera (Say, Planorbis). 
Over the state, common, preferably in quiet water. 
ANCYLIDA:. 
Ancylus diaphanus Haldeman. 
Cincinnati; Tuscarawas Co. (St.). 
Ancylus fuscus Adams. 
Cincinnati; Tuscarawas Co. (St.). 
tAncylus Kirklandi Walker. 
Summit Co. (Walker); Tuscarawas Co., e. g. common in the 
Tuscarawas River (St.). 
Ancylus parallellus Haldeman. 
Ohio Canal at Navarre, Stark Co. (St.). 
