288 s. GOTO. 



The mouth is situated at a short distance from the front end 

 of the body, and leads directly into the cavity of the pharynx. 

 The latter is drum-shaped, and along its anterior margin there 

 are nine openings of the glands situated in its wall. The oeso- 

 phagus is exceedingly short, and into it open by long necks the 

 numerous unicellular salivary glands situated between it and the 

 margin of the body. The cytoplasm of these glands is coarsely 

 granular and stains very deeply. The intestine divides into two 

 main simple branches, which proceed backwards and unite with 

 each other at a distance from the posterior end equal to about 

 one-third of the total length of the body. The lumen of the 

 intestine is lined by a one-layered epithelium consisting of flat 

 cells with small nuclei and a finely granular, weakly staining 

 cytoplasm (fig. 23). There appears to be neither circular nor 

 longitudinal muscle fibres for the intestine. 



There is only a single main excretory vessel on either 

 side of the body, from which numerous branches start in all 

 directions. Anteriorly, the main vessels of the two sides unite 

 with each other on the dorsal side of the brain, just as in 

 Tristomum, then again divide into two and ramify several times 

 at the front end of the body. At the level of the oesophagus 

 he main vessels are much dilated and open to the exterior, each 

 by means of a rather long vessel, on the dorsal surface of the 

 body. The terminal flame cells could be very distinctly ob- 

 served. 



Of the nervous system I have not been able to make out 

 very much. The main arrangement is perfectly similar to that 

 of most other species. The brain is situated directly in front 

 of the pharynx and contains four eye-spots arranged in the 

 corners of an isosceles trapezoid. 



