608 Mr. R. J. Ortlepp on a new 
A fine duct, vas efferens, arises from each testis; these 
eventually unite together to form the large and much con~ 
voluted vas deferens. The vas deferens commences just 
dorsal of the ovary, and its convolutions fill up the space 
between the ovary and the ventral excretory vessel ; having 
reached this vessel the vas deferens bends upwards, passing 
over and between it and the dorsal excretory vessel. It then 
again passes ventralwards and with a few convolutions passes 
dorsal of the nerve-trunk to join up with the cirrus. 
Throughont its whole course it is thin-walled with its lumen 
filled with spermatozoa. The cirrus is small, unarmed, and 
only feebly muscular; it is lodged inside the cirrus-pouch 
and its proximal portion may form one or two slight bends. 
The cirrus-pouch is pyriform in shape, about 100 w long 
and 40 ~ broad at its proximal end. It has a weakly mus- 
cular wall, possessing only a thin layer of muscular fibres. 
Its opening is on the edge of the proglottid, on a slight 
bulging overhung by the free posterior angle of the segment 
preceding. 
The ovary is situated in the middle of the segment. It 
consists of about 15 club-shaped lobules, radiating dorsally, 
anteriorly, and ventrally from their common centre. Its 
lateral diameter is about 200. <A slight concavity in its 
posterior face is occupied by the shell and yolk glands. The 
yolk-gland, which is about one-fifth as large as the ovary, 
occupies a position aporally, while the shell-gland, which is 
about one-twelfth as large as the ovary, occupies a more or 
Jess similar position on the poral side of the ovary. 
The vaginal aperture is situated immediately posterior to 
that of the cirrus-pouch; it passes straight inwards along. 
the posterior edge of the cirrus-pouch to the dorsal surface 
of the ventral excretory canal. This distal portion of the 
vagina is thick-walled and muscular, having a very small 
lumen. On passing over the ventral excretory canal it bends 
obliquely inwards, passing between the dorsal and ventral 
excretory canals, and at the same time its wall becomes much 
thinner and its lumen much enlarged. The portion of the 
female duct from here to the ovary I take to be the recepta- 
culum seminis, especially as it is in all mature segments 
filled with spermatozoa. The proximal portion of the 
receptaculum seminis bends obliquely upwards and _ passes 
into the ovary. 
A functional uterus is not developed; the eggs when found 
become scattered about singly throughout the central body 
parenchyma, being limited laterally by the ventral excretory 
vessels and dorsally aud ventrally by the transverse muscle- 
sheath. 
