/iD'emoirs of tbe /iDuseum of Comparative ZooIoq^ 



AT HARVARD COLLEGE. 

 Vol. XLI. No. 2. 



REPORTS ON THE SCIENTIFIC RESULTS OF THE EXPEDITION TO THE 

 EASTERN TROPICAL PACIFIC, IN CHARGE OF ALEXANDER AGASSIZ, 

 BY THE U. S. FISH COMMISSION STEAMER " ALI3ATR0SS," FROM 

 OCTOBER, 1904, TO MARCH, 1905, LIEUT. COMMANDER L. M. GARRETT, 

 U. S. N., COMMANDING, AND OF OTHER EXPEDITIONS OF THE "ALBA- 

 TROSS," 1888-1901. 



[Published by permission of George M. Bowers, U. S. Commissioner of Fish and Fisheries.] 



XXI. 



THE SPONGES. 



2. THE ERYLIDAE. 



By ROBERT VON LENDENFELD. 



WITH EIGHT PLATES. 



CAMBRIDGE, U. S. A.: 



lPrlnte& for tbe /IDuseum. 



September, 1910. 



