32 Art. 4.— T. Kaburaki : 



general colour of the head, which is characterized by a touch of 

 brown colour. The ventral surface is similar in colouring to the 

 dorsal, but the surface of the sole is more or less pale than the rest 

 of the ventral surface. 



Except on the apex of the lappets 

 the eye-sports are distributed all round 

 the margin of the head, where they are 

 exceedingly numerous, and also spar- 

 ingly present over the entire length of 

 the body to the posterior extremity. 



The mouth-opening which leads 



Text fig. 15. Distribution of . , . , i i i • 



eje-spots in Bipaiium trifuscostria- mto the peripharyngeal chamber is 

 turn, n. sp. situated at nearly the centre of the body. 



The genital aperture is placed at a distance behind the mouth- 

 opening equal to about one-third that between the latter and the 

 posterior end of the body. 



The epidermis is much thicker on the dorsal side than on the 

 ventral and contains numerous spindle-like rhabdites, evidently 

 wedged in between the epidermic cells. Numerous glands, em- 

 bedded in the parenchyme along the median plane of the body, 

 open out on the surface of the sole. 



The superficial muscular system is composed of the external 

 circular and the internal longitudinal layer. Separated from this 

 by a zone of tissue the deep muscular system is found, forming a 

 thick and continuous sheet which consists of two sets of fibres, 

 longitudinal and circular, occurring intermingled in the same mass. 



The mouth -opening lies near the centre of the peripharyngeal 

 pocket with the plicated pharynx. The gut trunks are provided 

 with numerous subdivided lateral branches, which are lined with 

 an epithelium of high cylindrical cells, each full of coarse, highly 

 refractive granules. 



The genital organs were, unfortunately, not yet well develop- 

 ed in the specimen examined. The genital opening leads into the 

 tubular atrium, which divides into two parts, anterior and posterior. 

 The former passes into a vesicle, the penis-sheath, which is wholly 

 devoid of any intromittent part of the penis. The muscular fibres 



