336 EliNEST WARREN. 



proximal portion of tlie tubes near to the entrance to tlie gut 

 is less swollen than the distal part, but the distinction is not 

 so strongly marked as in Paracorotoca . 



Colon. — The colon is expanded greatly and extends 

 tlirough the greater part of segments VI-VIII. In the case 

 of two female specimens sectioned the colon was situated 

 dorsally on the left side of the middle line. The ileum was 

 bent ventrally and ran backwards to join the mesenteron 

 ventral to the colon (PI. XVIII, fig. 45, il). In the single 

 male specimen examined the colon was more ventral, and 

 the ileum joined the mesenteron dorsal to it (PI. XVI, fig. 19, 

 taes. il.). Whether this is a sexual peculiarity or a mere 

 individual varirttion in the arrangement of the parts could 

 not be determined with the limited material. 



The colon has a pronounced muscular coat (PI. XIX, fig. 

 62). The ectodermal epithelium {'p. ec.) consists of small, 

 very irregularly shaped cells which are inert in character, 

 and more or less cuticularised as a whole, and not merely 

 covered by a tliin layer of chitin. 



Rectum. — The rectum is short and narrow; it leads to tlie 

 anus which is situated immediately dorsal to the geuir;il 

 aperture (PI. XVIII, v.). The ectodernuil epithelium consists 

 of short, fairly regularly arranged cells, and the cuticular 

 lining is more obvious than in the other portions of the 

 proctoda3um. 



Food. — Discrete masses of solid food were never found in 

 the gut. It was always filled with an eosinophilous granular 

 substance. In the oesophagus the substance was coarsely 

 granular and very highly eosinophilous, in the mesentei'on it 

 was finely granular, uniform in texture and less highly 

 eosinophilous, while in the colon it was very finely granular 

 and scarcely stainable. From the nature of the sucking 

 pharynx and from the extreme tenuity of the anterior 

 portion of the oesophagus we may conclude that the food 

 is entirely of a fluid nature. 



Nervous Systkm. — The central nervous system exhibits 

 considerable modification with reference to the absence of a 



