Notes on two new species of Japanese Polyclads. 



By 



Megumi Yen, Rigakushi, 



Nara Higher Normal School for Women. 



and 



Tokio Kaburaki, Rigakushi^ 

 Zoological Institute, Science College, Tokyo Imperial University. 



Xeostylochus fulvopunctatus, n. gen., n sp. 

 Textfigures i—j. 



This new genus and species is based on a single individual which 

 was obtained at Misaki between the tide-marks in the summer of 

 1906. 



Form and Size. — The worm in the living state was of a some- 

 what oval form with wavy margin and with the anterior end more 

 broadly rounded than the posterior. Without tentacles. The delicate 

 body measured 7 mm. long by 4.5 mm. broad. 



Colouration. — The body, which was translucent, presented a buffy 

 ground colour, much paler on the ventral than on the dorsal side. 

 The latter surface marked all over with moderately large brownish 

 spots, more crowdedly in the central parts than in the periphery. 



Eye-sfots. — Tentacular and cerebral eye-spot groups blend to- 

 gether. The tentacular eye-spots are larger than the cerebral. The 

 latter lie loosely scattered about in front of and between the two 

 groups of the former. In addition there are present numerous small 

 marginal eye-spots distributed in a crescent-shaped tract close to the 



