Icmoirs of % Htuscum of (!Tompunitib« ^joblojgn 



AT HARVARD COLLEGE. 

 Vol. XXIII. No. 1. 



REPORTS ON AN EXPLORATION OFF THE WEST COASTS OF MEXICO. 

 CENTRAL AND SOUTH AMERICA, AND OFF THE GALAPAGOS II- '.LANDS, 

 IN CHARGE OF ALEXANDER AGASSIZ, BY THE U. S. FISH COMMISSION 

 STEAMER "ALBATROSS," DURING 1891, LIEUT. COMMANDER Z. L. 

 TANNER, U. S. N., COMMANDING. 



XXI. 



DIE MEDUSEN. 



Von OTTO MAAS. 



MIT FUNFZEHN TAFELN. 



[Published by Permission of Makshali, McDonald and John J. Bkice, U. S. Commissioners 



of Fish and Fisheries.] 



CAMBRIDGE, U. S. A. : 



^rintcti for tljc J¥luscum. 

 September, 181)7. 



