4 Art. <!.— T. Kaburaki 



Tlie body in the living state is sleiit'er and nearly iiniforndy 

 broad for the most part of its length, though it tapers off consider- 

 ably in front. Both the anterior and posterior extremities are 

 bluntly pointed or rounded. Extending almost throughout the 

 whole length, in the mid-ventral line, is a slightly raised ridge, the 

 sole, which is not less than one-fifth the width of the body. Weil- 

 grown specimens measure 4O76O mm. in length and 2-4 mm. in 

 breadth. 



The ground colour of the dorsal surface is uniformly yellow or 

 yellowish brown with a fine black stripe, which medially extends 

 over the whole surface. As it approaches the anterior tip it 

 gradually assumes a darker tone. The ventral surface is a some- 

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

 surface of the sole which is nearly white. 



The eye-spots are arranged in one or two rows round the 

 anterior tip and continued, without any grouping, for a few mm. 

 dowai the sides. 



The mouth- opening which leads into the peripharyngeal 

 pocket is situated near the middle of the body. 



The common genital aperture is placed half-way between the 

 mouth-opening and the posterior end of the body. 



The epidermis consists of a single layer of columnar cells 

 which are about equally high on the dorsal and the ventral surface. 

 The sole possesses a ciliated epithelium, but the cilia appear to be 

 confined to this part of the ventral surface. Except on the surface 

 of the sole, the epidermis contains enormous quantities of ininute 

 spindle-like rhabdites, evidently wedged in between the cells. As 

 is well known, the rhabdites arise from their mother- cells, scattered 

 in fair abundance in the parenchyme beneath the epidermis, and 

 sometimes are seen to be in connexion with the latter. Scattered 

 in sparse numbers in the parenchyme are unicellular glands, which 

 open out at various points of the body-surface. Besides this, there 

 are enormous quantities of glands wdiich occur deeply embedded in 

 the parenchyme and make their way to the surface of the sole. 



The musculature of the body is differentiated into two sys- 

 tems, superficial and deep. The superficial system, innnediately 



