Memoirs of the Museum of Comparative Zodlogy 
AT HARVARD COLLEGE. 
Vor. XOGXTX. No. 4: 
REPORTS ON THE SCIENTIFIC RESULTS OF THE EXPEDITION 
TROPICAL PACIFIC, IN CHARGE OF ALEXANDER AGASSIZ, 
U. 
COMMANDING. 
XXII. 
TO THE 
BY THE 
S. FISH COMMISSION STEAMER “ ALBATROSS,’ FROM AUGUST, 
1899, TO MARCH, 1900, COMMANDER JEFFERSON F. MOSER, U. S. N., 
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- 
MANDING. 
XXXIII. 
HOLOTHURIOIDEA. 
By HUBERT LYMAN CLARK. 
WITH FOUR PLATES. 
{Published by Permission of H. M. Smith, U. S. Commissioner of Fish and Fisheries]. 
CAMBRIDGE, U. S. A:: 
Printed for the Museum. 
SEPTEMBER, 1920. 
