A474, WILLIAM NICOLL. 
The genital aperture is situated just behind the intestinal 
bifurcation, to the left of the middle line, although not much. 
The testes are symmetrically situated midway between the 
ventral sucker and the end of the body, They are somewhat 
further back than in St. furciger. Their long axes are 
always a trifle oblique, the anterior end being directed out- 
wards. They measure ‘15 by *12 mm. The cirrus-pouch is 
bulbous or nearly globular, and lies entirely in front of the 
ventral sucker. Its internal structure is the same as that of 
St. furciger, but the pars prostatica is longer and narrower, 
as are also the two parts of the vesicula seminalis. 
The ovary is situated immediately in front of the right 
testis. It is multilobate, but very small. The yolk-glands 
are much more extensive than in St. furciger. They extend 
from the testes forward to the level of the middle of the cirrus- 
pouch, i.e. well in front of the ventral sucker. In St. fur- 
ciger they do not reach the anterior border of the sucker, 
The transverse yolk-ducts run obliquely backwards to unite 
at the level of the anterior border of the testes in a small 
median yolk-reservoir. In none of my specimens was the 
uterus very voluminous. A few convolutions were found 
between the testes and stretching back to the posterior end 
of the body. The terminal part runs forwards on the left side 
of the ventral sucker to open into the sinus genitalis. The 
ova are not particularly thin shelled, and measure ‘044-056 
by °028—-032 mm. 
The chief diagnostic features of this species may be 
summed up as follows: Post-acetabular region shorter than 
pre-acetabular region, Cisophagus twice as long as pharynx, 
Excretory vesicle nearly V-shaped. Yolk-glands extending 
in front of ventral sucker. 
The introduction of this species within the genus Sterin- 
gophorus involves only two modifications of Odhner’s 
definition. The words “Saugnipfe genadhert” and ‘ Stamm 
(der Exkretionsblase) gabelt sich zwischen den Hoden” 
should be deleted. 
A species which bears a striking superficial resemblance to 
