tcmoirs of % Iftuscum of (£omp;uittiuc Soblogii 



AT HARVARD COLLEGE. 



Vol. XXXV. No. 1. 



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. 



VIII. 



THE HYDROIDS. 



By SAMUEL F. CLARKE. 



WITH FIFTEEN PLATES. 



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



CAMBRIDGE, U.S.A.: 



Printed for tije iHuseum. 



February, 1907. 



