^ :^ 



' 7 7-/ 



If-' 7 / ^jmoirs of l^t P^ttseum of Comparatrbe ^oologg 



'S 



r^.;i:<^y 



I' 



-m^ . 



AT HARVARD COLLEGE. 

 Vol. XXX. No. 1. 



/. 



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 U. S. FISH COMMIS- 

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

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



XXX. 



THE SPONGES. 



,.-■« 



By H. V. WILSON. 



WITH TWENTY-SIX PLATES. 



[Published by Permission of Marshall MoDohXlo and Grobob M, Bowers, U. S. tiommissioners 



of Fish and Fisheries.] 



CAMBRIDGE, U.S.A.: 



^rtntetj for tfje JHuseum. 



.. July, 1904. ,■ 





