440 W. N. F. WOODLAND 



are also seen to unite just below the extreme tip of the head 

 (PI. 24, fig. 4). I could detect no ' faserzellenstrange ', such as 

 have been described by Will (27) in C. laticeps, and by 

 Skrjabin (23) in C. s y r d a r j e n s i s . 



The testicular region is short relatively to the length of the 

 body as compared with the same region in C. laticeps 

 and other previously described species. It contains a central 

 core of testes (PI. 24, fig. 2, tes) in, and a thin strand of vitellaria 

 (vit) on each side of, the central medullary area. The finer 

 branches of the vasa deferentia unite and eventually open into 

 a median main vas deferens (PI. 24, fig. 7, vdef) which forms 

 a stout cirrus surrounded by a large cirrus-sac (cirs). The 

 main vitelline duct lies on the inner side of each strand of 

 vitellaria. 



The cirrus opening (PL 24, fig. 2, co) marks the boundary 

 between the testicular and uterine regions. Immediately 

 behind the male aperture lies another and somewhat smaller 

 opening — the vagino-uterine aperture (PI. 24, figs. 2, 7, vuo) — 

 which, as the name implies, serves both as an entrance to the 

 vagina aad as an exit for the eggs from the uterus. An atrium 

 or depression surrounding the two apertures is absent. The 

 vagina (vag) is a straight or slightly convoluted fairly wide 

 tube which runs in the median line on the ventral side of 

 the body direct from the vaginal aperture to the ovary. Open- 

 ing into the vagina on its dorsal side and from the right, at 

 a point immediately above the opening of the vagina to the 

 exterior, is the narrowed anterior end of the uterus (PI. 24, 

 fig. 7, uop). From the point where it thus opens into the vagina 

 the uterus (ut) curves forward (thus rendering it impossible 

 for the cirrus to enter it) and bends to the left in front of the 

 male aperture, then turns posteriorly and crosses the vagina 

 dorsally to the right, and thence pursues its course jjosteriorly 

 as the dilated much convoluted canal shown in PI. 24, figs. 2 

 and 8. In all of my mature specimens the uterus is full of shell- 

 covered eggs. Posteriorly and immediately in front of the 

 ovary, the vagina develops a slight but constant dilatation, 

 the receptaculum seminis (PI. 24, fig. 8, rcps), then inclines to 



