/Iftemotrs of tbe /iftuseum of Comparative Zooloov? 



AT HARVARD COLLEGE. 

 Vol. XLII. 



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. COMMANDER L. M. GARRETT, 

 U. S. N., COM^IANDING, AND OF OTHER EXPEDITIONS OF THE "ALBA- 

 TROSS," 1891-1899. 



XXIX. 



THE SPONGES. 



3. HEXACTINELLIDA* 



By ROBERT VON LENDENFELD. 



WITH ONE HUNDRED AND NINE PLATES. 



PLATES. 



[Published by permission of Hugh M. Smith, U. S. Commissioner of Fish and Fisheries]. 



CAMBRIDGE, U.S.A.: 



IPrinteO for tbe /iDuseum. 



June, 1915. 



