MOLLUSCA OP 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. 

 fPlanorbis dilatatus buchanensis Lea (t. Walker). 



New Philadelphia (St.). 

 fPlanorbis opercularis multilineatus Vanatta, opercularis orego- 

 n ens is Vanatta. X 

 Geauga Lake, east of Cleveland (Allen, t. Vanatta). 

 Planorbis excacuous Say, exacutus. 



Over the state. 

 fPlanorbis rubellus Sterki, exacutus var. rubellus. 



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

 Counties (St.). 

 fPlanorbis umbilicatellus Cockered . X 



Summit and Tuscarawas Counties (St.). 

 Planorbis deflectus Say. X 



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, hirsutus Gould. Pal. 



Stark and Tuscarawas Counties (St.) ; probably over the 



state. 



Planorbis parvus Say. 



Over the state, common and variable. 

 fPlanorbis circumlineatus Try on. 



Summit and Tuscarawas Counties (St.). Some conchologists 

 regard it as a variety of parvus; so far as my materials 

 show, it 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. 



ancylid^;. 



Ancylus diaphanus Haldeman. 



Cincinnati; Tuscarawas Co. (St.). 

 Ancylus fuscus Adams. 



Cincinnati; Tuscarawas Co. (St.). 

 fAncylus Kirklandi Walker. 



Summit Co. (Walker) ; Tuscarawas Co., e. g. common in the 

 Tuscarawas River (St.). 

 Ancylus parallellus Haldeman. X 



Ohio Canal at Navarre, Stark Co. (St.). 



