TEICHOCEPHALUS DISPAR. 331 



like the tips of the branches of a Pucord's uterine speculum, by 

 which the vagina is kept expanded and the entrance of the penis 

 is rendered possible ; this, from its small diameter, certainly 

 requiring a means of support during its stay in the vagina. This 

 tube can never act as a sucking apparatus for adhesion. 



With this we quit the description of the male, and beg the 

 reader to compare PI. VII, figs. 1 and 1'. The serrated 

 denticulation of the lateral walls is omitted ; compare the 

 female, fig. 2. 



In the female the intestine, after it has become widened again 

 suddenly behind that contraction which follows upon the portion 

 of the intestine which is furnished with cseca, runs in the form of 

 a strong tubular sac, entirely or partially covered by the oviferous 

 organs, and remaining tolerably straight, and of nearly the same 

 diameter, directly to the extremity of the abdomen, when it 

 becomes narrowed into the form of a cleft, by a muscular closing- 

 apparatus a little way from the caudal extremity ; but at its point 

 of issue forms a tolerably broad anus, appearing as a circular 

 orifice, which projects in a verrucose, nearly square excrescence 

 in the centre of the extremity of the abdomen. 



The disentanglement of the finest terminations of the female 

 sexual apparatus is a matter of great difficulty, but the following 

 may be detected with ease. 



Between the little cseca above-mentioned and the anterior end 

 of the pyriform stomach, in the same place where the semi- 

 niferous organ of the male bends over from the inner side out- 

 wards, a twisted, tolerably thick tube runs directly over the 

 intestine, transversely towards one side (the outer side) of the 

 worm, where it opens with an orifice of about 0*08 mill. 

 =0-03G'" Par. =0037"' V. in diameter in the lumen. The 

 vagina possesses no appendage projecting outwards, as is the case, 

 for example, in the vagina of many Trichdsoma. This is the 

 opening of the vagina. Its commencement quickly makes 

 some narrow convolutions of equal calibre posteriorly, and then 

 becomes dilated into a pretty large, simple, uterine, tubular sac, 

 which runs straight backwards immediately upon and over the 

 intestine, and which after it has passed through about six-sevenths 

 of the length of the entire abdomen of the worm, turns back 

 upon itself and runs forward, then again backward, and still 

 nearer to the anus, without, however, quite reaching it, runs back, 

 coiled and complicated in convolutions, which gradually become 



