W. Nicoll 
337 
death, it always assumes a transverse oval shape. It is, moreover, 
more sessile than usual. The oral sucker has a diameter of 0'23 mm. 
or rather less than Jg-th of the body length. The diameter of the 
ventral sucker is 0 - 35 mm. so that the ratio is 2:3. The ventral 
sucker is situated a little more than ird of the body length (09 mm.) 
from the anterior end. There is a very short prepharynx and the 
almost globular pharynx measures about OT mm. in diameter. The 
oesophagus is barely half as long again as the pharynx and the 
bifurcation takes place about midway between the pharynx and the 
anterior border of the ventral sucker. 
The excretory vesicle is simple and extends forward to the level of 
the ovary. 
The testes are situated just behind the middle of the body, always 
directly tandem and contiguous. The post-testicular space comprises 
about |th of the body length, but it varies from ^th to -J^th. The 
posterior testis is always the larger of the two. They are confined 
between the intestinal diverticula and are never overlapped by yolk- 
glands. The outline of each testis is irregularly lobed, the lobing being 
in the majority of cases well-marked and unmistakable. The number 
of lobes is not constant, but there are usually from five to seven. In 
addition each lobe is frilled or sub-divided into smaller lobules. The 
lobing is entirely lateral and posterior. The anterior surface from 
which the vas efferens issues is comparatively even. The anterior 
testis is less lobulated than the posterior. The condition is most 
pronounced in young specimens; in old specimens the lobes appear to 
get pressed out by distension so that on a cursory examination the 
outline looks merely uneven. On careful inspection, however, the 
traces of the lobes can always be made out. Even in the largest 
specimens the testes are frequently as much cut up as in the younger 
ones. In specimens which have been incompletely fixed the outline of 
the testes is not uncommonly indefinite and under such circumstances 
it might be regarded as unlobed. The breadth of each testis is about 
0'37 mm. The length of the anterior one is slightly less; that of the 
posterior rather more. 
The genital aperture is situated in the middle line, in front of the 
intestinal bifurcation and near the middle of the oesophagus. The 
cirrus-pouch is short and narrow. It is straight or very slightly curved 
and extends back to the anterior border of the ventral sucker, or a 
little beyond it. It contains a convoluted vesicula seminalis and 
a moderately long ductus ejaculatorius which is also slightly convoluted. 
