﻿DEVELOPMENT 
  OF 
  THE 
  OYSTER. 
  

  

  Plate 
  X. 
  

  

  J4. 
  

  

  SI). 
  

  

  5"^. 
  

  

  S7. 
  

  

  58, 
  

  

  S9, 
  

  

  60. 
  

  

  61. 
  

  

  6Z, 
  

  

  62, 
  

  

  6^. 
  

  

  W. 
  K. 
  Brooks, 
  Del 
  

  

  6S. 
  

  

  G6. 
  

  

  