14 Dr. W. NicoU on the 



of the body-length. The testes are tandem, transversely 

 ovoid, and measure about '21 x "26 mm. In every case they 

 are contiguous. The ovary lies immediately in front of the 

 anterior testis, but displaced a little to the right side. It is 

 also transversely ovoid, but is considerably smaller than the 

 testes, measuring •17x'12 mm. There does not appear to 

 be a rece))taculuni seminis. The yolk-glands are exceedingly 

 well developed and very conspicuous. Neither Stossich nor 

 Looss describes their disposition accurately. They are 

 situated for the most part under the dorsal surface of the 

 body, but a ventral fringe of uniform breadth extends from 

 the posterior end of the body to a point a short distance in 

 front of the ventral sucker. This fringe lies over the outer 

 side of the intestinal diverticula, and nowhere throughout its 

 whole extent crosses to the iimer side of the diverticula. 

 Dorsally the follicles are much more extensive. They fill 

 the whole of the post-testicular space. Forwards they extend 

 in towards the middle line and overlap the testes and ovary 

 to a considerable extent. They thin out a little at the level 

 of the uterus, but in front of the ventral sucker they again 

 become voluminous and extend across the entire breadth of 

 the body. Their anterior limit is the same as in the case of 

 the ventral fringe. The common yolk-ducts are ventral and 

 cross between the ovary and anterior testis, to unite in the 

 yolk-reservoir. 



The genital aperture lies close to the anterior border of the 

 ventral sucker. It is not median in position, but is displaced 

 a little to the left side. The genital sinus is of small size. 

 The ductus ejaculatorius opens into it on the right side, the 

 vagina on the left. The cirrus-pouch lies dorsal to the 

 ventral sucker and invariably terminates at the posterior 

 border of the latter. The anterior narrow part of the pouch 

 is always bent more or less abruptly on the more swollen 

 posterior part. The latter contains a single simple globular 

 or ovoid vesicula seminalis, in close connexion with which 

 is a comparatively large pars prostatica, also nearly globular 

 in shape. Prostatic cells do not appear to be numerous, 

 although the pars prostatica is filled with a large amount of 

 secretion. The ductus ejaculatorius is short and fairly 

 straight. Tiie uterus occupies the space between the anterior 

 testis and the genital aperture, confined by the intestinal 

 diverticula on either side. Unlike the uterus in the genera 

 Echinostomum and Stephanochasmus, it frequently forms 

 several convolutions dorsal to the ventral sucker, so that 

 Looss is not quite exact in saying that it is confined between 

 the ovary and ventral sucker. The vagina is short and 



