flDemotra of tbe fDuseum of Comparative Zoology 



AT HARVARD COLLEGE. 

 Vol. XXXIX. No. 4. 



REPORTS ON THE SCIENTIFIC RESULTS OF THE EXPEDITION TO THE 

 TROPICAL PACIFIC, IN CHARGE OF ALEXANDER AGASSIZ, BY THE 

 U. S. FISH COMMISSION STEAMER "ALBATROSS," FROM AUGUST, 

 1899, TO MARCH, 1900, COMMANDER JEFFERSON F. MOSER, U. S. N., 

 COMMANDING. 



XXII. 



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.. 



prtnteo for tbc flDuseum. 



September, 1920. 



