138 



Snccinea avara Say. 



Vigo County. 

 Succinea ohiiqua Say. 



Vigo County. 



FKESH WATER UNIVALVES. 



Bulinus hypnorum Linnaeus. 



Coffee Chute, Gibson County. 

 Limnaa caperata Say. 



Vigo County. 

 Limnophysa humilis Say. 



Very abundant on marshy banks of the Ohio, in spiings at New Albany ; 

 found in 1894 in myriads. 

 Limnophysa reflexa Say. 



Ponds, Vigo County. 

 Physa gyrina Say. 



Marion County ; probably found everywhere in the State ; exceedingly abund- 

 . ant in pools on the Falls of the Ohio. 

 Helisoma trivolvis Say. 



Vigo County. 

 Planorhella campanulata Say. 



Ponds, Vigo County; Lake Maxinkuckee. 

 Pleurocera subidare Lea. 



Wal)ash River, Vigo County. 

 Plurocera canaliculatum Say. 



Very abundant on the Falls of the Ohio; on muddy banks of the Wabash 

 River, at Terre Haute, occurs in myriads. A large number of specimens 

 were collected in October, 1895, at the last named locality, which present 

 a wide range of variation, both in the characteristic grooving of the 

 body-whorl and in coloration. Many specimens occurred without any 

 indication of a groove ; in others the angle, which is found along the 

 lower border of the body-whorl, may be sharp, or obtuse, and is fre- 

 quently thickened at intervals, constituting a character that makes a 

 number of specimens approximate Pleurocera moniliferuni Lea. Any one 

 of a half dozen species belonging to the pleurocerid group, of which ca;(a- 

 llculatum is a type, might be separated from the material before me. 

 Many thousands of this shell have been taken at the Falls of the Ohio 



