374 
S. .1. JOHNSTON, 
in the bay of the posterior intestinal commissure^ extends 
forward on the left side as far as the ovary in front. The 
anterior, while it does not extend so far posteriorly, reaches 
in front nearly to the middle of the body. The two vasa 
deferent! a, each formed by the confluence of several smaller 
ducts, join one another about the iniddle of the body, whence 
they run forward as a single tube, ventral to the uterus, to a 
level approaching the anterior part of the intestine. Here 
this tube expands into an elongated vesicula seminalis which 
lies within the posterior end of the weakly developed cirrus 
sac. The latter lies partly in front of and partly behind the 
intestinal fork ending at the genital pore. The ejaculatory 
duct is somewhat twisted, and bears a small prostate in 
relation to its proximal end. The ovary is a small oval body 
(0T42 by 0’086 mm.), situated on the left side just inside 
the intestinal limb and in front of the posterior testis. The 
oviduct, running at first posteriorly, soon expands into the 
ootype, which is surrounded by the shelHbglands and lies 
behind the ovary. The uterus, entirely confined to the space 
between the intestinal limbs and filling up almost the whole 
of this space, is closely coiled, and presents a peculiar appear- 
ance in whole mounts owing to the coils running backwards 
and forwards between the dorsal and ventral surfaces (figs. 
28 and 30). The terminal part is a well-marked vagina opening 
into the genital chamber. 
The yolk-glands, consisting of very small and very numerous 
follicles (’022 mm. in diameter), cover the whole of the outer 
aspect of the intestinal limbs, and to some extent spread right 
round them, but are mainly confined to their ventral and 
outer surfaces. The two lateral groups become continuous 
round the posterior aspect of the intestine. The transverse 
yolk-ducts leave the longitudinal ones about the level of the 
ootype, and join together to form a small yolk reservoir that 
opens into that chamber. There is no Laurer^s canal nor 
receptaculum seminis. 
In none of the specimens did the uterus, a comparatively 
immense tube, contaiu any eggs, but a few were found on the 
