﻿DEVELOPMENT 
  OF 
  THE 
  OYSTER. 
  

  

  Plate 
  VII. 
  

  

  Fi^. 
  48. 
  

  

  

  

  

  ^M^&0M?' 
  

  

  F{^A9, 
  

  

  W. 
  K. 
  Brooks, 
  Del, 
  

  

  