﻿DEVELOPMENT 
  OF 
  THE 
  OYSTER. 
  

  

  Plate 
  VI. 
  

  

  ,.^ill 
  

  

  

  Fl^ 
  43s 
  

  

  Fvg, 
  47- 
  

  

  W. 
  K. 
  Brooks, 
  Del. 
  

  

  