As in the Tseniae, there are seen, in the anterior 

 portion of the body, two filiform longitudinal canals, 

 filled with a limpid fluid. These Moquin-Tandon 

 considers to be the alimentary canal. Kuchenmeister, 

 who observed the same appearances, does not give 

 any opinion as to what they may be. 



" According to M. Blanchard, this parasite possesses 

 a nervous system, analogous to the Tsenise, but much 

 less distinct " (Moquin - Tandon). Kuchenmeister, 

 however, states in his work (op. cit.\ that no ner- 

 vous system has been discovered. 



The skin presents nothing very worthy of remark. 

 It is divided, as in the Tsenise, into a corium and 

 epidermis, which is inverted at the generative open- 

 ings, and which contain calcareous corpuscles; more 

 abundant about the genital openings, and the hinder 

 margins of the segments. The parenchymatous por- 

 tion shows contractile cellular tissue, which consists 

 of threads, running at right angles, forming a wide 

 network, containing within them calcareous bodies ; 

 and also very weak transverse and stronger longitudi 

 nal muscular striae, which, however, are less dense 

 than in the Tsenise (Kiichenmeister). 



The eggs of this species (PL II. figs. 4, B, 5) are 

 quite large, of an elliptical or ovoid shape, of a brown 

 color, and consist of but one covering (Weinland). 

 which is hard, brittle, and translucent, and through 

 which the segmented yolk is visible. They are fur- 

 nished with an operculum (PL II. fig. 5, ), and are 

 very numerous ; each individual Bothriocephalus, ac- 

 cording to M. Eschricht, containing ten millions of 

 eggs (Moquin-Tandon). 



