F. J. Meggitt 
387 
they do not fuse with those of a neighbouring segment. No fusion of 
ducts having taken place, the development is arrested at that stage 
and no opening not cirrus can be developed. 
Female Organs. 
The female organs of the second group present no peculiarities 
worth mentioning. In the first group the ovary (Figs. 7 and 8, ov.) 
has the form of an arc with a plane side following the margin of the 
proglottis, the other side sending out at right angles numerous lobes 
which stretch half-way across the arm. The lateral ends of the ovary 
are at the limit of the inner two-thirds of the length of the arm, i.e. 
from arm 2 to arm 3 the ovary occupies exactly the inner third, following 
the margin. Its plane border is exceptionally close to the musculature, 
touching it in some places. At its exact mid-point on the lobed (i.e. 
inner) side is the ooclapt (ooc.). On either side of this, for a short 
distance, the ovary is only a simple unlobed band, the lobes only 
occurring lateral to all female ducts and glands with the exception of 
the uterus. In structure, the ovary corresponds to the usual Anoplo- 
cephala type. 
The vitelline gland (y.g.) is two-lobed, lying internal and slightly 
posterior to the ovary. Externally it nearly touches the band part of 
the ovary, laterally it stretches as far as the lobes, filling the break in 
their line. Posteriorly its two lobes communicate by a narrow bridge 
from which proceeds the vitelline duct ( y.d .). In the hollow of the 
“ U ” thus formed lie the oviduct and shell-gland. 
The receptaculum seminis (r.s.) is rather variable in position. 
Usually it lies slightly towards the arm 3 side of the exact centre, with 
its inner end pointing towards the ovary through the U-shaped hollow 
of the vitelline gland and its outer end to the corresponding position 
at the junction of arms 1 and 3. Occasionally it swings round upon 
its inner (oviducal) end until its vaginal end points towards the corre¬ 
sponding position at the junction of arms 1 and 2. In shape it is rather 
elongated and slightly bent, with the concavity directed towards the 
arm 3 side of the ovary. 
The shell-gland ( sh.gl .) has the usual shape, is rather compact and 
surrounds a small ootype. It is usually on the arm 2 side of the 
receptaculum seminis, near and anterior to its oviducal end, but it may 
also be on the arm 3 side. This variability bears no relation to that of 
the receptaculum seminis. The shell-gland is partly enclosed between 
the two lobes of the vitelline gland. 
