W. Nicoll 
331 
The excretory vesicle is a short simple sac, not extending further 
forward than the level of the anterior testis. 
The genital aperture is situated a little in front of the intestinal 
bifurcation and is displaced somewhat to the left of the middle line. 
This would appear to be the characteristic position in the genus 
Lebouria. The cirrus-pouch is club-shaped, with a slight bend, and 
extends on to the dorsum of the ventral sucker but does not reach 
further back than the centre of the latter. It encloses a convoluted 
vesicula seminalis, much resembling that of L. idonea. The ductus 
ejaculatorius is short and almost straight, but occasionally it is some¬ 
what convoluted. As in L. idonea, a pars prostatica is not distinctly 
differentiated, although prostatic cells are present. The testes are 
situated a little behind the middle of the body. They are placed 
invariably contiguous and obliquely, the anterior testis being always 
a little to the left. In only an occasional immature specimen were the 
testes directly tandem; in adults they were always oblique. No 
instance of amphitypy was observed. This oblique position of the 
testes would appear to be another characteristic of the genus for it 
occurs also in L. alacris, L. obducta and also, though not invariably, in 
L. idonea. They are of irregular ovoid shape, frequently approximating 
to a rounded triangular outline. The posterior testis is not uncommonly 
somewhat heart-shaped, with the apex directed backwards. They have 
never the transverse oval shape that commonly occurs in L. idonea. 
Their average diameter is about 0 - 2 mm. or a little less than |th of the 
body length. The post-testicular space (i.e. space between posterior 
testis and end of body) is 0'28 mm. in length, that is, nearly -|th of the 
body length or somewhat less than one and a half times the diameter of 
the testis. 
The ovary is situated midway between the anterior testis and the 
ventral sucker. The position, however, varies with the state of the 
animal, so that it may at one time be contiguous to the anterior testis, 
at another almost immediately behind the ventral sucker. Normally it 
is separated from the latter by a loop of the uterus and from the testis by 
the receptaculum seminis or occasionally the yolk-reservoir. It invariably 
lies to the right of the middle line and is a globular body with entire 
margins and a diameter of 0T05 mm. 
The receptaculum seminis is pear-shaped and is situated on the 
same level as the anterior testis and contiguous with it as well as with 
the posterior testis and the ovary. Occasionally it lies almost dorsally 
to the ovary, as occurs in L. idonea. It is usually of considerable size. 
