Description of Some Japanese Polyclad Turbellaria. 5 



tortuous course upward and backward, and after receiving the 

 unpaired common uterine duct, proceeds farther backward to enter 

 the horseshoe-shaped accessory vesicle in the medial part. 



In the features of its anatomy the worm is apparently closely 

 allied to IHscocelis tUjrina (Blanchard) [Lang 1884] known from 

 Naples, but may be distinguished from this in the colour marking 

 as well as in the arrangement of cerebral eye-spots. On the 

 strength of that fact, the present Japanese form may be held to be 

 specifically distinct from the Neapolitan. 



Family Styloclii<l:v Stimpson (Bock 1913 emend.). 

 Genus Stylochus Ehrbg. 1831. 

 3. StfjlnchtiH rufilus, n. sp. 



(PL II., fig. 1.— Textfig. 2). 



A single specimen of this new species was obtained at Mera 

 on the southern coast of Pro v. Awa, in the summer of 1906. 



Body oval or elliptical, of a moderately firm consistence, 

 measuring 30 mm. in length and 15 mm. in breadth. 



Colour of dorsal surface reddish orange or brick colour, dotted 

 more or less uniformly with minute reddish spots. In the region 

 of pharynx runs medianly a deeply reddish line, which may be 

 bordered laterally by a zone of a much lighter tone in colour. 

 Vental surface pale whitish, without pigment, showing pharynx 

 and reproductive system with moderate distinctness. 



Nuchal tentacles short, conical, orange-coloured, situated at a 

 distance of 5 mm. from frontal margin, and 3 mm. apart. 



2 Tentacular eye-spots confined to 



the basal parts of each tentacle. Cerebral 

 eye-spots distributed close together over 

 the brain region and between the ten- 

 tacles. Exceedingly numerous additional 

 eye-spots present along body margin in 

 the anterior half of the body (textfig. 2). 

 ■ivxtfio-. 2. Eye-spots of styiochus Mouth nearly exactly in the centre 



r " t,l " s ' of body! Male and female genital aper- 



tures approximated, both situated near the posterior bod} 7- end. 



