34 Art. 2.— T. Kaburaki: 



matter which is made up of the fusion of three or more ovoidal 

 bodies. The cell contains a nucleus near the base, the protoplasm 

 being characterized by fine striations. At its base the cell receives 

 the supply of nerve fibres. In the epidermis itself the rhabdites 

 are found in large numbers wedged in between the component 

 cells. They are best developed on the dorsal surface and well on 

 the lateral surfaces, but on the ventral surface they become much 

 fewer in number and smaller in size. Scattei-ed about in the 

 parenchyma just beneath the dermal musculature occur the rhab- 

 dites enclosed in their parent cells, which on some occasions are 

 found to continue their way to the surface. In the parenchyma 

 there are numerous glandular cells, which, as is well known, open 

 out submarginally on the ventral surface as well as at various 

 points all over the surface of the body. 



The dermal musculature consists of three distinct layers of 

 circular, transverse and longitudinal muscular filjres. The circular 

 fibres lie immediately beneath the basement membrane, and form 

 but a very thin layer, beneath which is a thin layer of transverse 

 fibres. The longitudinal fibres occur in a series of tliick bands, 

 each made up of a number of separate fibres. 



Digestive System. — The mouth-opening lies about l)etween the 

 middle and the posterior third of the body. It leads into the 

 pharyngeal chamber, in which the cjdindrical phaiynx is horizon- 

 tally disposed. The pharj^nx, which in length is equal to about 

 one-fourth the body-length, is inserted at about the middle of the 

 body or slightly in front of it. In structural respects the organ 

 presents no features calling for special remark. The anterior gut 

 trunk extends to a point in front of the brain and is provided 

 with 8 or 9 pairs of numerously subdivided branches, while each 

 posterior trunk gives off 18-20 lateral branches and about as many, 

 but extremely short, inwardly directed branches. Occasionally 

 there occurs a transverse connexion between the posterior trunks. 



Excretory System. — Situated in the dorsal parenchyma are 

 found two main excretory canals on each side of the dody, which 

 especially in the anterior region give off numerous fine ductules, 



