142 TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



the genital cloaca, and in preserved specimens the cirrus 

 usually protrudes from the opening of the former. 

 The Female Organs (PI. Ill and fig. 3). 



The ovary is rather small, and is situated on the right 

 side between the ventral sucker and anterior testis. It 

 is trilobate in shape in the published descriptions of the 

 species, but in my specimens there are always three equal- 

 sized, rounded lobes in a horizontal plane, and dorsal to 

 these, and nearly over the anterior lobe, another from 

 which a short, thin duct takes origin. Immediately 

 dorsal to the ovary, and usually obscured by the latter in 

 cleared preparations, is a capacious receptaculum seminis. 

 The little duct leaving the ovary joins the former at its 

 anterior border. There is a projection of the recepta- 

 culum seminis on its dorsal and anterior part, and from 

 this a fairly wide and thick-walled duct — Laurer's canal 

 —takes origin, runs at first backward and upward 

 forming a prominent bend, and then passes obliquely 

 forward to open on the dorsal surface of the body and 

 nearly in the middle line. Laurer's canal was empty 

 in my specimens. The receptaculum seminis contained 

 granular matter, the nature of which could not be deter- 

 mined : it was probably broken down spermatozoa. 



Just where the duct from the ovary joins the 

 receptaculum seminis the ootype takes origin. This is a 

 very narrow tube which runs at first directly forward, 

 through a mass of loose gland follicles, which together 

 form the shell-gland. Emerging from the latter (which, 

 of course, opens into it) the ootype enlarges greatly to 

 form the uterus, and the latter is thrown into a series of 

 close convolutions filling up most of the space between 

 ovary and receptaculum seminis behind, and ventral 

 sucker forward. The uterus is not nearly so capacious as 

 in many other trematodes. Its general appearance and 



