Description of Some Japanese Polyclad Turbellaria. og 



Dorsal tentacles conical, of the same colour as body, situated 



each on a dear spot at the hind end of the first quarter of body. 



23 Tentacular group of eye-spots arranged in a 



.... . circle at base of each tentacle. Cerebral 



eye-spots in two paired groups as shown in 



the adjoining figure (textfig. 23). 



In structural respects this species closely 



resembles the preceding. At first we were 



e 1?5.ocL fur^ea" ° f inclined to hold that we had before us simply 



certain small individuals of PI. reticulata. 



However, the constant association of the small body size with the 



peculiarities noted above has led us to specifically separate the 



form from that species. 



Genus Paraplanocera Laidlaw 1903. 

 11. Paraplatiocera misakiensi», n. sp. 



(PI. IL, fig. 5.— Textfigs. 24-20). 



A single representative of this new species was captured be- 

 tween the tide-marks in the neighbourhood of Misaki. 



Body oval or broadly elliptical, with frilled margin, measuring 

 SO mm. long by 25 mm. broad. 



Colour of dorsal surface olive-bufry. dotted irregularly with a 

 large number of minute milky white spots, intermingled with some 

 others of a dark brownish colour. Besides, there exist all along 

 the body margin numerous minute yellow and white dots in a 

 single or more rows. Gut branches may be well discerned on the 

 dorsal surface. Ventral surface similar in colour to the dorsal, but 

 without the pigment spots; the pharynx visible in the median line 

 24 as a m ilky white space; male and female 



genital end-organs also discernible to a cer- 

 tain extent. 



Dorsal tentacles small, conical, yellowish 

 m colour, situated at about one-third the 

 length of body from the anterior margin. 



rextfig. 24. Eye-spots of t i 



Parapianocera misakiensis. lentacular eye-spots form a complete 



circular group at base of each tentacle-; 



