﻿40 
  Report 
  on 
  the 
  New 
  York 
  State 
  Museum. 
  

  

  Bythinia 
  tentaeulata, 
  LiDn., 
  lot. 
  

   Limnaea 
  catascopium, 
  Say, 
  lot. 
  

   Limnsea 
  elodes, 
  Say, 
  lot. 
  

   Physa 
  heterostropha, 
  Say, 
  lot. 
  

   Physa 
  ancillaria, 
  Say, 
  lot. 
  

   Physa 
  gyrina, 
  Say, 
  lot. 
  

   Planorbis 
  trivolvis, 
  Say, 
  lot. 
  

   Planorbis 
  bicarinatus, 
  Say, 
  lot. 
  

   Planorbis 
  parvus, 
  Say, 
  lot. 
  

   Planorbis 
  hirsutus, 
  Gould, 
  lot. 
  

   Planorbis 
  deflectus, 
  Say, 
  lot. 
  

  

  