18 Art. 2.— T. Kaburaki : 



the trunk, from whicli it is indistinctly separated by a slight neck- 

 like narrowing. The trunk is slender, almost uniformly broad 

 down to about the region of the copulatory organs, and gradually 

 tapers to a rounded hind end. The most striking feature is the 

 presence of a linear series of small, low and truncate papillae in 

 the mid-dorsal line, the papillae numbering 20-25 in all. The 

 series of the papillae commences sometimes in front of, and at 

 other times behind, the eyes. Largest specimens measured 

 7-8 mm. long by 1-1-5 mm. broad, the ratio of the breadth to 

 the length being 1 : 6-7. 



Colouration. — The general colour of the dorsal surface in the 

 larger specimens is somewhat grayish, due to scanty development 

 of pigments, ieaving the lighter median zone, in which the dorsal 

 papillae again frequently appear as blackish spots. Younger and 

 smaller indvidiuals are quite or nearly colourless. 



Eyes, — The two eyes, each surrounded by a colourless area, 

 are situated in the region of the neck-hke portion; the distance 

 between them is less than that between either of the eyes and 

 the lateral neck-margin, and very much less than that between 

 them and frontal margin. 



Body Wall. — The epidermis is somewhat thicker on the 

 dorsal surface than on the ventral. It contains minute rhabdites 

 wdiich occur in greater abundance dorsally than ventrally. Es- 

 pecially the rhabdites are found crowded in the part of the little 

 process or papilla. The epidermis rests, as usual, on a fine base- 

 ment membrane, beneath which come two layers of circular and 

 longitudinal muscular fibres. The rauscles are relatively weakly 

 developed. Below the dermal musculature, in the parenchyma, 

 there occur in wide and scattered distribution such rhabdites as 

 are still contained in their mother-cells. In the tissue of the 

 papilla they are found in great abundance. Besides, embedded 

 in the parenchyma there exist numerous glands, which open out 

 submarginally on the ventral surface as well as at various points 

 of the entire surface of the body. 



Digestive System. — The mouth-opening lies at a position be- 

 tween the middle and the posterior thirds of the body. The 



