Description of Some 1 Japanese Polyclad Turbellaria. 35 



eye-spots occurring over the brain region in two approximated 



clusters on a colourless area. 



A sucker present nearly in the centre of the ventral surface. 

 Mouth at about the hind end of the first fifth of body. Pharynx 

 much plicated. Main gut extending from pharyngeal chamber 

 behind nearly to the posterior body end. Lateral intestinal 

 branches anastomose and are continued into dorsal papillge with- 

 out opening to the exterior. 



A pair of male genital apertures on either side of the median 

 line, closely behind the pharyngeal chamber. Slightly behind 

 them occurs the single female aperture. Parts of internal genital 

 organs quite as known from the Mediterranean examples. 



Genus Pseud ocer oh Lang 1884. 

 17. Pseudoeeros rttirufattiH, n. sp. 



(PI. I., fig. 3.— Textfigs. 38, 39). 



Numerous specimens of this species were obtained between 

 the tide-marks at both Misaki and Shirahama. 



Body somewhat oval, leaf-like with strongly crenulated margin, 

 very delicate in texture. Length 38 mm. ; breadth 15 mm. 



Dorsal surface showing all over a coarse reticulum of broad 

 olive-gray bands, with a number of much lighter coloured mesh- 

 like spaces of moderate sizes. Minute black pigment dots scattered 

 -almost uniformly all over the surface. The reticulating bands run 

 into a dark median band over the main gut; this band, in its, 

 turn, contains a median series of short and small colourless stripes. 

 Central surface pale. 



Marginal tentacles appearing as flap-like projections of the 

 frontal margin. Numerous eye-spots scattered on both dorsal and 

 ventral surfaces of marginal tentacles; cerebral eye-spots forming a 

 single group in a round clear spot a short distance behind the 

 tentacles. 



A sucker situated in the centre of body. Moutli in the 

 anterior body parts closely behind the brain; pharynx frizzled- 

 like in appearance. Main gut extending nearly to the posterior 

 body end. 



