338 
Entozoa of Fishes 
A distinct pars prostatica appears to be absent as in the case of Podo- 
cotyle and Lebouria, but a number of gland-cells are present within the 
cirrus-pouch, which discharge irregularly into the ductus. 
The ovary is situated immediately in front of and contiguous to the 
anterior testis and is much smaller than it. It may be either in the middle 
line or a little to the right or left. It is irregularly lobed, there being 
usually three or four main lobes each with an irregular outline. The 
anterior part from which the oviduct takes origin may also be considered 
an additional lobe. Most commonly its breadth greatly exceeds its length, 
but occasionally it is more compact. The receptaculum seminis is pear- 
shaped and of large size. It lies usually on the right side of the ovary, 
but not infrequently it is found on the left. From it a long Laurer’s 
canal is given off. From the receptaculum the oviduct proceeds inwards 
to the ootype, receiving on its course the yolk-duct. The yolk-reservoir 
is small and lies in front of the ovary. The yolk-glands are extensive 
and have a definite and fairly constant configuration. Their greatest 
variation occurs in the neck. Here they usually stop short of the 
posterior end of the pharynx, but they may extend a little in front of 
this or terminate at the level of the middle of the pharynx. They are 
mainly lateral in position, following the coui’se of the intestinal diverti¬ 
cula. They thus proceed inwards towards the intestinal bifurcation and 
in some cases the follicles unite in the middle line dorsally. In a few 
specimens there was a certain amount of proliferation in this region but 
in the great majority no union takes place. Behind the ventral sucker 
the follicles are entirely to the outer side of the intestiual diverticula, 
except at the level of the uterus where they overlap to a certain extent. 
At the level of the testes the yolk-glands never completely overlap 
the diverticula. In the post-testicular space their distribution is 
characteristic. They follow the outer border of the diverticula to their 
termination, turn there and follow the inner border of the diverticula 
to the posterior end of the second testis. No fusion of the follicles 
takes place in this space, the excretory vesicle always serving as a 
dividing mark between those on either side. 
The uterus is confined to the space between the ovary and the 
ventral sucker. The condition of the ova gives it a configuration which 
is peculiar to the genus and unique amongst the Allocreadiinae. In 
mature specimens it is arranged in the form of a spiral of three to five 
loops, superimposed on each other, and each a little in advance of the 
one below. Each ovum at its anopercular end is provided with a long 
filament, which is six to eight times as long as the ovum. These 
