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ALLAN HANCOCK PACIFIC EXPEDITIONS 



VOLUME 2 NUMBER 12 



MARINE MOLLUSKS FROM PANAMA 



COLLECTED BY THE ALLAN HANCOCK 



EXPEDITION TO THE GALAPAGOS 



ISLANDS, 1931-1932 



(Plates 18-23) 



BY 



A. M. STRONG AND LEO GEORGE HERTLEIN 



THE UNIVERSITY OF SOUTHERN CALIFORNIA PRESS 



LOS ANGELES, CALIFORNIA 



1939 



