STATE ZOOLOGIST. 231. 



56. Planorbis trivolvis, Say. 

 *51. " truncatus, Nobis. 



58. Physa heterostropha, Say. 



59. " elongata, Say. 



60. " Hildrethiana, Lea. 



61. " vinosa, Old. 



62. Limnea approssa, Say. 



FAMILY MELANIADAE. 



11. Melania Virginica, Say. 



18. " * depygis, Say. 



19. " Niagarensis, Lea. 



80. " neglecta, Anth. 



81. " livescens, Menka. 



82. " pulchella, Anth. 



FAMILY PALUDINIDAE. 



83. Valvata sincera, Say. 



84. " tricarinata, Say. 

 *85. " humeralis, Say. 



86. Paludina decisa, Say. 

 81. " integra, Say. 

 88. " isogona, Say. 



