W. Nicoll 
109 
enclosed by any muscular or fibrous membrane. The ductus ejacula- 
torius is very short. The testes are extremely numerous and fill up 
almost the whole of the median field of the post-acetabular region. 
They are separated from the ventral sucker by the first convolution of 
the uterus, and they extend back to a point about T7 mm. from the 
posterior end. Each testicle is small, transversely oval and fits closely 
against the adjoining testicles. The outermost testicles overlap the 
intestinal diverticula to a slight extent. Posteriorly the testicles are 
disposed in a single layer but anteriorly they are in two layers. 
The ovary lies close behind the ventral sucker on the right side or 
the left. It is a moderately large transversely oval body. Behind it 
and dorsally lies a small horse-shoe shaped receptaculum seminis 
separated from it by the transverse yolk-duct. The receptaculum 
seminis gives off Laurer’s canal direct and the latter is remarkable for 
its unusual width and muscular development. It is somewhat con¬ 
voluted but of no great length. The short duct from the receptaculum 
seminis unites with the oviduct to form the ootype, which is short and 
curved. The yolk glands are extremely voluminous. They are lateral 
and extend in a broad band from the level of the pharynx to near the 
tip of the tail, where, however, they do not unite. These lateral bands 
lie to the outer side of the intestinal diverticula, but overlap them to 
some extent both dorsally and ventrally. In addition there is an 
internal row on each side, situated on the inner side of the diverticula 
and dorsal to the testes. This internal row, however, only extends half¬ 
way from the tail to the ventral sucker and is discontinuous in places. 
The outer and inner bands of follicles are connected by short transverse 
ducts passing dorsal to the intestinal diverticula. The uterus is short 
but wide and contains a considerable number of eggs. In its course 
it passes thrice across the body, dorsal to the ventral sucker. The 
terminal part of the uterus has its walls thrown into curious regular 
folds (seen in fig. 13). The vagina issues from this part as a short, 
narrow tube running straight to the genital aperture. The eggs are 
golden yellow in colour and measure 0 - 07 to 0'075 x 0'04 to 0 - 045 mm. 
