314 ANIMAL PA11ASITES. 



animal the contents of the intestine are seen moving towards the 

 apex of the abdomen. The relations become more distinct when 

 the worm is torn to pieces, and I have had the opportunity of 

 confirming Luschka's statements with regard to the ordinary 

 nature of the intestinal canal. At the base of the pyriform or 

 infundibuliform body which is formed by the anterior part of the 

 canal at its passage into the hinder third, we always observe a 

 pair of lateral pedunculated vesicles, which, according to my 

 observations, hang more loosely behind, or depend from the sides 

 perpendicularly upon the intestine. I regard them either as a 

 kind of caecum, or as glands. 



The hindermost part of the intestinal canal always exhibits, 

 according to Luschka, an epithelium-like layer, without any 

 perceptible second layer serving as a foundation. The rest of 

 the intestine presents a homogeneous membrane with scattered 

 elementary granules. 



Lastly, Luschka refers to an occurrence with regard to the 

 intestine, which Bischoff and Farre also appear to have observed, 

 but which I could not succeed in seeing. Once, namely, after 

 artificial preparation, the intestine appeared as though its wider 

 portion consisted of two lateral halves, between which a thin 

 canal led into the funnel-shaped structure, and passed at once 

 into the thinner end. Bischoff, in connection with this, speaks 

 of a longitudinal vessel; for my part I regard this discovery 

 as the result of preparation, and do not think that it re- 

 presents an ovigerous organ which passes into the anterior 

 part of the worm, as Luschka appears inclined to think. I will 

 pass immediately to the organ which represents the first founda- 

 tions of the genitalia, and speak hereafter more particularly 

 upon the presence or absence of an anus. Besides the intestinal 

 canal, running directly from the mouth to the extremity of the 

 abdomen, and furnished with a pyriforrn or infundibuliform 

 stomach, of which we have just spoken, a second tube, which is 

 always distinct, may be detected in the hinder third of the body. 

 In the description of its course and the indication of its desti- 

 nation I differ to a certain extent from Luschka. The latter 

 states that the tube commences with a csecal portion at the 

 place where the intestine acquires the infundibulate form, and 

 proceeds, without any bending, nearly to the end of the tail. 

 Here the rounded extremity of this tube is seen, without any per- 

 ceptible opening, although this must exist, according to Luschka. 



