200 



BIBLIOGRAPHY OP 



Page. Name. 



271 Lymn^a Vahlii Beck. 



Limnophijsa Vahlii Beck. 

 271 Physa ancillaria Say. 



var. P. Sayi Tappan. 

 271 distorta Hold. 



271 fragilis Mighels. 



271 gyrina Say. 



var. P. elliptica Lea. 

 271 heterostroph.a Say. 



var. P. aurea Lea. 

 271 hypnorum Linn, (var.) 



P. elongata Say. 

 271 obesa De Kay. 



271 osculans Hald. 



271 scalaris Jay. 



272 Ancylus diaphanus Hald. 

 272 fuscus Adams. 



272 obscurus Hald. 



272 parallelus Hald. 



272 rivularis Say, 



272 tardus Say. 



Locality. 

 Greenland. 



Pennsylvania. 

 Ohio. 



St. Louis. 



Maine. 



Ohio. 



Indiana. 



New York. 



Virginia. 



New York. 



Mohawk river. 



Mexico. 



Florida. 



Ohio. 



Massachusetts. 



Tennessee. 



New England. 



Pennsylvania. 



Vermont. 



Oedeb PECTINJBMA]VCHIATA. 





Family Melauiana. 





272 



Melania aequalis Hald. 



Nolachucky river. 



272 



altilis Lea. 



Susquehannah river. 



272 



alveare Conrad. 



Tennessee. 



272 



annulifera Conrad. 



Alabama. 



272 



approxima Hald. 



Tennessee. 



272 



armigera Say. 



Tennessee. 



273 



bella-crenata Hald. 



Alabama. 



273 



Boykiniana Lea. 



Georgia. 



273 



Buddii Lea. 



Tennessee. 



273 



caliginosa Lea. 



Tennessee. 



273 



canaliculata Say, 



Ohio. 



273 



catenaria Say. 



South Carolina. 



273 



catenoides Lea. 



Georgia. 



273 ' 



Cincinnatiensis Lea. 



Ohio. 



273 



clavaeformis Lea. 



Tennessee. 



273 



comma Conrad. 



Alabama. 



273 



congesta Conrad. 



Alabama. 



273 



conica Say. 



Ohio. 



273 



costulata Lea. 



Tennessee. 



