PART II.— EXPLANATION OF PLATES 



Note: Objects are reproduced in natural size except where otherwise 



indicated. 



Abbreviations for Collections 



U C Coll.- Collection in Walker Museum of the Uni- 

 versity of Chicago 



U I Coll.- Collection in the Museum of Natural His- 

 tory, University of Illinois 



K Coll.- Collection of Wilbur T. Knoblock, 1901 



Ohio St., Quincy, Illinois 



C Coll.- Collection of George Condie, 320 E. Erie 



St., Spring Valley, Illinois 



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