-44 Art. 4.— T. Kaburaki : 



front of the middle of the body. The ventral surface is a somewhat 

 paler shade of the same colour as the dorsal, except for the surface 

 of the sole Avhich is pale. 



At a little distance behind the anterior end there are present 

 two eyes, one on each side. 



The mouth-opening is situated near the middle of the body, 

 leading into the peripharyngeal chamber, in which is disposed the 

 pharynx of a cylindrical shape. 



The common genital aperture occupies a position behind the 

 mouth-opening equal to about one-third the distance between the 

 latter and the posterior end of the bod}^ 



The body is coated with a single epidermis made up of colum- 

 nar cells, which are of a greater height on the dorsal side than on 

 the ventral and possess cilia, but confined to the latter surface only. 

 Situated between these cells, except on the ventral surface, are 

 spindle-shaped rhabdites, which originate from their mother-cells, 

 scattered in the parenchyme below the dermal musculature. On 

 some occasions the rhabdites are seen to be in connexion with their 

 mother-cells. Embedded in the parenqhyme are enormous quan-» 

 titles of glands, opening out on the surface of the sole. 



The musculature of the body presents no noteworthy features, 

 consisting, as it does, of two systems, superficial and deep, which 

 are rather more strongly developed on the ventral than on the 

 dorsal side, doubtless in relation to the mouvements. Besides, 

 -(iorso- ventral muscles occur, running between the intestinal 

 branches. 



The mouth-opening is placed at about the centre of the peri- 

 pharyngeal chamber with the pharynx horizontally disposed. The 

 pharynx is a short cylindrical body, terminating conically at the 

 free end. The gut trunks are provided with numerous bifurcated 

 lateral branches, the epithelium of which consists of high cylindrical 

 cells, each full of coarse, highly refractive granules. 



The brain is a bilobed organ, situated at the anterior part of 

 the body. Posteriorly each half of the brain-mass gives rise to 

 one of the longitudinal nerve cords, whicli proceed straight back- 

 wards, running parallel to each other. Throughout their entire 



