﻿DEVELOPMENT 
  OF 
  THE 
  OYSTER. 
  

  

  Plate 
  V. 
  

  

  ^' 
  1*1^ 
  3S 
  

  

  Ti<i.41 
  

  

  W. 
  K. 
  Brooks, 
  Del. 
  

  

  FiJ.42. 
  

  

  