JOURNAL OF THE COLLEGE OF SCIENCE, IMPERIAL UNIVERSITY, 

 TOKYO, JAPAN. 



VOL. XVII., ARTICLE 11. 



Observations on the Japanese Palolo, 



Ceratocephale osawai, n, sp, 



By 



Akira Izuka, Rigakushi. 

 Assistant Professor of Zoology, Imperial University, Tokyo. 



With 2 plaies. 



The investigation, the results of which are embodied in the 

 following pages, was begum in the summer of 1896 and_carried 

 on at intervals during the three following years, partly in the 

 Laboratory of the Zoological Institute and partly in a room hired 

 for the purpose of facilitating the collection of fresh materials. 



The subject was taken up at the suggestion of Professor 

 Ijima, who has also kindly undertaken the work of revising the 

 manuscript. To him and also to Professor Mitsukurt I lieg to 

 express my sincere thanks for the help and advice which they 

 have frequently extended to me in connection with my work. 

 Further I am under deep obligation to Professor K. Osawa of 

 the medical college, who, being himself much interested in observ- 

 ing the breeding and swarming habits of the worm described in 

 this paper, has favored me with valuable information and 

 suggestions. 



