2H oil 





*mmrs oi % Utestttm 0f Ccrmparattb-e stoiilajjg 



AT HARVARD COLLEGE 



Vol. XXX. No. 1. 





i 



REPORTS ON AN EXPLORATION OFF THE WEST COASTS OF MEXICO, 

 CENTRAL AND SOUTH AMERICA, AND OFF THE GALAPAGOS ISLANDS, 

 IN CHARGE OF ALEXANDER AGASSIZ, BY THE II. S. FISH COMMIS- 

 SION STEAMER "ALBATROSS," DURING 1891, LIEUT. COMMANDER 

 Z. L. TANNER, U.S.N-;, COMMANDING. 



THE SPONGES, 



By II. V. WILSON. 



WITH TWENTY-SIX PLATES. 





V 



[Published by Permission of Marshall McDonald and George M. Bowers, U. S. Commissioners 



of Fish and Fisheries.] 



^*- 



\ ■ 





CAMBRIDGE, U.S.A.: 



PrtttteU for tlje jttuaeunu 



July, 1904. 



MiMMI 



