aMemoirs of the Museum of Comparative Zoology 
AT HARVARD COLLEGE, 
Vou, XAT, No. d, 
REPORTS ON AN EXPLORATION OFF THE WEST COASTS OF MUXYCO, 
CENTRAL AND SOUTH AMERICA, AND OFF THE GALAPAGQS ISLANDS, 
IN CHARGE OF ALEXANDER AGASSIZ, BY THE U. 8S. 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 Marswant McDonatp and Joun J. Brion, U. 8. Commissioners 
of Fish and Fisheries. ] 
CAMBRIDGR, U.S. A.: 
Printed for the Museum. 
SEPTEMBER, 1897. 
$ 
