20 ^rt. 4.— T. Kaburaki : 



According to the late Professor Ijima's notes and sketches 

 taken when the worms were hving, the head, which was dorso- 

 ventrally depressed, was semi-lunar or oval in shape, a great deal 

 wider than the trunk, and marked off from the trunk hy a neck- 

 like narrowing. In the creeping state the frontal margin of the 

 head gave rise to numerous serrated processes. The trunk in the 

 preserved state is elongate, slender and of a uniform breadth for 

 the greater part, though it tapers extrem el}^ gradually in the hind 

 parts, to end with a blunt point at the posterior extremity. Dor- 

 sally, the body is slightly convex and yentrally nearly liât. From 

 the base of the head to the posterior end of the bod}^, in the mid- 

 ventral line, is the slender sole, forming a prominently raised 

 ridge, rather less than one-fourth the breadth of the body. Large 

 worms may reach 50 mm. in length and 3 mm. in breadth, while 

 one of the smallest measured 9 mm. long by 2 mm. broad. 



The ground colour of the dorsal surface is ver}^ dark mixed 

 with a slight olive tint and marked with a fine black mid-longi- 

 tudinal line, extending almost throughout the whole length of the 

 body. Anterior!}^ the line loses itself gradualh^ in the general 

 colour of the head, which is much lighter than that of the body. 

 The ^'entral surface is of a gray colour, except on the sole where 

 the colour is pale. 



The eye-spots thickly surround the entire fringe of the head, 

 continuing sparsely along the sides of the body. At the sides of 

 the neck they form, as usual, a crowded cluster. 



The mouth-opening which leads into the peripharyngeal 

 chamber lies somewhat behind the middle of the body on the sole. 



The common genital aperture is placed at the Hind end of the 

 first third of the distance between the mouth-opening and the 

 posterior extremity of the body. 



The epidermis consists of a single layer of columnar cells rest- 

 ing upon a fine basement membrane and contains numerous 

 spindle-shaped rhabdites, evident^ situated between the cells. 

 The rhabdites enclosed in the subcutaneous cells occur in wide 

 distribution over various parts of the body. In addition to the 

 glands opening on the surface of the sole, there are some glands- 



