﻿DEVELOPMENT 
  OF 
  THE 
  OYSTER. 
  

  

  Plate 
  I. 
  

  

  Pio^l 
  

  

  

  Ks 
  5. 
  

  

  

  W. 
  K. 
  Brooks. 
  Del. 
  

  

  Vi^ 
  9 
  

  

  