﻿Paj>e?8y 
  

  

  UNIVALVES 
  

  

  Plate 
  XVII 
  

  

  3a 
  

  

  31} 
  

  

  10 
  b 
  PF 
  14)1, 
  

  

  JACKSON 
  TERTIARY 
  SHELLS 
  

  

  