Memoirs of the Museum of Comparative Zodlogyv 
AT HARVARD COLLEGE. 
Von. SULT. 
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., COMMANDING, 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 Huan M. Smiru, U. 8S. Commissioner of Fish and Fisheries]. 
CAMBRIDGE, U.S. A.: 
Printed for the Museum, 
JUNE, 1915. 
