/IDemoirs of tbe /iDuseum of Comparattve ZoSlog? 



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 "ALBATROSS," FROM 

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

 U. S. N., COMM.\NDING, AND OF OTHER EXPEDITIONS OF THE "ALBA- 

 TROSS," 18SS-1904. 



XXI. 



THE SPONGES. 



2. THE ERYLIDAE. 



By ROBERT VON LENDENFELD. 



WITH EIGHT PLATES. 



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



CAMBRIDGE, U. S. A.: 



lprinte& for tbe nDuseum. 



September, 1910. 



