



AT HARVARD COLLEGE. 



Vol. XXX. No. 1. 



3 



KEPOETS ON AK EXPLORATION OFF THE WEST COASTS OF MEXICO, 

 CENTRAL AND SOUTH AMERICA, AND OFF THE GALAPAGOS ISLANDS, 

 IN CHARGE OF ALEXANDER AGASSIZ, BY THE IT. 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, 



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



of Fish and Fisheries.] 



CAMBRIDGE, U.S.A.: 



$rmtet» for tfje JHttsettm* 



July, 1904. 



