Umotrs of tire SJuseum of domparatibe stoblogp, 



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 I'LATES. 



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



CAMBRIDGE, U.S.A.: 



Printed for tlje fftuseum. 

 February, 1907. 



