W. Nicoll 
27 
distance from the edges of the body throughout their whole extent. 
They reach to within a short distance of the posterior end of the body. 
They are of moderate width and somewhat irregular contour. 
The median genital aperture lies rather less than 0-1 mm. in front 
of the ventral sucker. The terminal male genitalia are of unusual type. 
The cirrus-pouch is reduced to enclose only the terminal part of the 
ductus and forms an oval muscular genital sinus, into the side of which 
the uterus opens. The sinus measures 0-13 x 0-10 mm. and lies entirely 
in front of the ventral sucker, with which it is almost contiguous. Into 
the proximal end of the sinus opens the short ductus, which issues from 
a large pars prostatica. The latter curves round the left border of the 
ventral sucker and is surrounded by large masses of prostatic cells, 
which lie free in the body parenchyma. The vesicula seminahs, which 
also lies free, is comparatively large and extremely convoluted. It is 
situated in the space between the ventral sucker and the ovary. 
The ovary hes on the right side abont 0-26 mm. behind the ventral 
sucker. It is an irregularly ovoid body and its onthne shows one or 
two indentations. Its dimensions are 0-26 x 0-21 mm. The testes are 
obliquely tandem. The anterior testis lies 0-26 mm. behind the ovary, 
on the left side and close against the left intestinal diverticulum. The 
posterior testis is separated from it by a space of 0-16 mm. and lies close 
against the right intestinal diverticulum. Both are ovoid or sub- 
globular and their outhne is distinctly crenated. The mean diameter 
of the testes is abont 0-46 mm. but the posterior is, as a rule, a trifle 
larger and more ovoid. The post-testicular space is rather more than 
two-fifths of the body length. 
Alongside the ovary is a small discrete shell gland. The yolk glands 
are very voluminous. They are lateral and extend from the level of 
the ovary to near the posterior end of the body. They completely 
enclose the intestinal diverticula but do not overlap the ovary or testes. 
In the post-testicular space they attain a width of 0-4 mm. on each 
side and leave only a small clear space in the middle line of the body. 
Occasionally there appears to be a tendency to fusion towards the end 
of the body, but as a rule the glands on each side are distinctly separated 
throughout their whole extent. 
The uterus is poorly developed and is confined to the space between 
the anterior testis and the ventral sucker. In no case were eggs observed 
behind the anterior border of the anterior testis. The eggs are few in 
number and thin-shelled, with a well-marked operculum at the blunt 
pole. They measure 0-061-0'064 x 0-039-0-041 mm. 
