﻿- 
  PALEONTOLOGY 
  OF 
  ILLINOIS, 
  

  

  SECTION 
  ill. 
  

   DESCRIPTION 
  OF 
  FOSSIL 
  INVEETEBEATES. 
  

  

  By 
  Charles 
  Wachsmuth 
  

   and 
  

   W. 
  H. 
  Barris. 
  

  

  I 
  

  

  

  I 
  

  

  