ILLUSTRATED CATALOGUE 



MUSEUM OF COMPARATIVE ZOOLOGY, 



AT HARVARD COLLEGE. 



Published by order of the Legislature of Massachusetts. 



No. III. 

 MONOGRAPH OF THE NORTH AMERICAN ASTACIDiE. 



BY 



DR. HERMANN A. HAGEN. 



CAMBRIDGE: 



FOR SALE BY SEVER AND FRANCIS. 



18 70. 



