294 



AMERICAN JOURNAL 



LIMN^ID^. 

 LIMN^INiE. 



40. LlMN^A STAGNALIS, 



41. Nekistoma columella, 



42. llmnophysa keflexa, 



planoebin^. 



55. Planorbella campanulatus, 



56. Helisoma trivolvis, 



57. " bicarinatus, 



58. Menetus exacutus, 



59. Gyraulus deflectus, 



60. " PARVUS, 



61. Planorbula armigera, 



ANCYLIN^. 



62. Ancylus fuscus, 



63. " parallelus, 



STEEPOMATID^. 



64. Pleurocera subulare, 



65. goniobasis livescens, 



YIVIPAEID^. 



QQ. MeLANTHO INTEGRA, 



Linnaeus. 



Say. 



Say. 



Tryon. 



Say. 



Say. 



Say. 



Say. 



Jay. 



Lea. 



Gould. 



Say. 



Say. 



Lea. 



Linn^us. 



Say. 

 Say. 

 Say. 

 Say. 

 Say. 

 Say. 

 Say. 



Adams. 

 Haldeman. 



Lea. 

 Menke. 



Say. 



