JOURNAL OF TîTK COLLRRE OF SCIKNCK. TOKYO IMPERIAL UKtVERSTTY, 



VOL. XLIV., ART. 3. 



On some Japanese Tricladida Maricola, with a 

 Note on the Classification of the Group. 



By 



Tokio KaburakI, 



Zoological Institute, Science College, Imperial University, Tokyo. 



^Vitli 1 plate and 6 text figures. 



, Introduction. 



Up to the present, only three specie^' of marine ïriclads have 

 been known to occur in Japanese territories, viz., Frocerodcs lactea, 

 Siummeria trigonocephala and Ectoj)lana llmuli. So far I ha^'e not, 

 as yet, been a])le to obtain any other species. Doubtless more 

 will be discovered in the Empire. In the present paper I shall 

 try to describe the anatoni}^ of these species as fully as I possibly 

 can. Besides, I shall avail myself of the opportunity to propose 

 a new classification of the marine Triclads. 



Before proceeding further, I wish to express my sincere 

 gratitude to the late Professor Isao Ijima, under whose kind super- 

 vision this investigation has been prosecuted. My best thanks 

 are due to Mr. J. T. Saunders of the Zoological Laboratory, 

 Cambridge University, for looking over my manuscript. Also I 

 gladly take this opportunity of thanking Baron Hajfao, former 

 President of the Tokyo Imperial University, for the stipend, 

 without which it would have been difficult for me to carry out the 

 work. 



