W. Nicoll 
119 
The pharynx is contiguous with the oral sucker and has a diameter 
of 0T5 mm. The short oesophagus measures 0'20 mm. in an average 
specimen. The intestinal diverticula diverge widely to enclose the 
testes and pass back between the yolk glands and the ventral sucker. 
About the level of the ovary they turn in towards the middle of the body 
but their ends are diverted outwards again. They reach to within 
0'5 mm. of the posterior end, but their termination is always obscured 
by the uterus. Their walls are irregular in outline and there are fre¬ 
quent bulgings. 
The excretory vesicle consists of a simple narrow sac extending 
forward to a short distance behind the ovary. The excretory pore is 
somewhat dorsal. 
The genital aperture is median, a little in front of the intestinal 
bifurcation. The cirrus-pouch is small and slender, measuring usually 
about 0'5 mm. in length. It contains a proportionately large con¬ 
voluted vesicula seminalis, a very small pars prostatica and a short 
straight ductus. There are remarkably few prostatic cells. The testes 
are situated symmetrically in front of the ventral sucker and closely 
opposed to it. Occasionally they overlap it to a slight extent. They 
also lie in contact with the intestinal diverticula, which they usually 
overlap to a greater or less extent. Their outline is extremely irregular 
but is not lobed. Their long diameter does not exceed 0 - 65 mm. and 
it is directed tangentially to the edge of the ventral sucker, against 
which the testis lies. They occupy almost the whole thickness of the 
body. 
The ovary lies almost immediately behind the ventral sucker, a 
little to the left of the middle line. Its outline is also irregular but not 
nearly so much so as that of the testes. Its greatest diameter is about 
0 - 27 mm. On its inner side and behind it lies a large receptaculum 
seminis. Laurer’s canal is present. It is short and straight and opens 
immediately in front of the level of the receptaculum seminis. The 
yolk glands are entirely lateral and are almost confined to the outer 
side of the intestinal diverticula. They extend from the level of the 
anterior border of the ventral sucker to a little behind the level of the 
ovary. The transverse yolk ducts unite behind the ovary. The uterus 
is extremely highly convoluted and does not follow any very constant 
course. The initial convolutions, however, are usually found on the 
left side immediately behind the ventral sucker. Thence the course is 
backwards and towards the right side. A number of pale-coloured 
convolutions are usually seen at the right posterior end of the body. 
