F. J. Megoitt 
195 
The cirrus-sac is small and pear-shaped, the greatest diameter being intern¬ 
ally, 0*14-0-16 mm. long x 0*04 mm. dia., and does not reach the nerve. The 
cirrus is unarmed and opens into a small straight vesicula seminalis which fills 
the remainder of the sac. Outside the cirrus-sac the vas deferens forms a bundle 
of loose coils extending as far as the inner longitudinal excretory vessel, there 
breaking up into the vasa efferentia. The testes are numerous, 120-130 in each 
proglottis, and form two groups, separated only for a small space by the 
female organs. On the aporal side they number 106—the number in the pro¬ 
glottides counted was remarkably constant—and are arranged in the form of 
a wedge with the longer axis lying transversely across the strobilus and the 
testes more numerous laterally than medianly. They extend as far anteriorly 
as the margin of the preceding proglottis. Half-way across they diminish to 
two rows along the posterior border and to a single row at their junction with 
the female organs. The poral group consists of from 15-20 testes arranged in 
a double row along the posterior margin and not extending further anteriorly 
than the vagina. Like the aporal group, these narrow to a single row on 
reaching the female organs. The two groups are separated only by the dia¬ 
meter of the yolk-gland, appearing under a low magnification to be a con¬ 
tinuous row along the posterior margin, the yolk-gland apparently baing the 
connecting link. Laterally both groups extend beyond the two excretory 
vessels, but do not pass the nerve. Dorso-ventrally the testes lie in a single 
layer, but in a few places this may be doubled. 
The female glands lie porally, a quarter of the distance across the pro¬ 
glottis, internally to both poral excretory vessels. The ovary lies on the ventral 
surface immediately median to the inner excretory vessel, half-way between 
the anterior and posterior margins. It is small and straggling, the lobes being 
long and slender and only slightly connected with one another. Posteriorly 
and aporally to it is the yolk-gland, also lobed but with blunter processes. 
The distal portion of the vagina is thick-walled and surrounded with gland 
cells. On crossing the lateral nerve, this portion communicates by an ex¬ 
ceedingly fine duct with a large thin-walled receptaculum seminalis full of 
spermatozoa, constricted in places, and extending almost to the ovary. Dorsal 
to the latter is the shell-gland. A definite but ephemeral uterus is developed. 
The oviduct, after passing through the shell-gland, runs anteriorly and be¬ 
comes a thick-walled glandular tube with an exceedingly narrow lumen. On 
arriving dorsally to the receptaculum seminis the lumen increases, the walls 
become studded with nuclei and the duct, curving internally, opens into the 
uterus. This latter is a thin-walled sac with a narrow dorso-ventral diameter 
occupying only one-fifth of the proglottis but extending laterally beyond both 
excretory vessels and reaching the nerve. In it the eggs are arranged in a 
single layer: occasionally one or two become pushed one on top of the other 
but there is never any outgrowth as figured by Janicki (1910, PI. XII, fig. 13) 
for I nermicapsifer hyracis (Pall.). The degeneration of the uterus and the forma¬ 
tion of the egg-capsules agree very well with the account of Janicki just 
13—2 
