﻿U 
  S 
  NATIONAL 
  MUSEUM 
  

  

  PROCEEDINGS. 
  VOL. 
  98 
  PLATE 
  4 
  

  

  1. 
  Dorsal 
  view 
  of 
  central 
  nervous 
  system 
  of 
  Oncumelania 
  hupensis 
  Gredler, 
  X 
  30. 
  

  

  2. 
  Right 
  side 
  view 
  of 
  central 
  nervous 
  system 
  of 
  Pomatiopsis 
  lapidaria 
  Say, 
  X 
  25. 
  

  

  3. 
  Three-quarters 
  view 
  of 
  central 
  nervous 
  system 
  of 
  Oncomelania 
  hupensis 
  Gredler, 
  X 
  25. 
  

   [c-p-c=cerebro-pedal 
  connective; 
  /(r 
  = 
  cerebral 
  ganglion; 
  /^/=left 
  pleural 
  ganglion; 
  

  

  of 
  = 
  ocular 
  nerve; 
  o< 
  = 
  otocyst; 
  /) 
  = 
  pedal 
  ganglion; 
  p/-/)-c= 
  pleural 
  pedal 
  connective; 
  

   ^p=parapodial 
  ganglion; 
  j/)z 
  — 
  subintestinal 
  ganglion; 
  j-i 
  = 
  supra-intestinal 
  ganglion.] 
  

  

  