236 s. GOTO. 



PL XXVI. Mouth small, at the plane of the hinder end of the 

 anterior suckers. Oesophajus wanting. Intestinal trunks with nu- 

 merous lateral branches, terminating at the front end of the posterior 

 sucker, widely separated from each other. Common genital opening near 

 the left lateral margin of the body, a little in front of the hinder 

 end of the anterior sucker; leading into a deep genital atrium, in 

 which lies the club-shaped penis with its smaller end directed out- 

 wards. Ovary spherical, comparatively small, in the median line, 

 at the end of the anterior third of the whole body. The oviduct 

 arises at the anterior end of the ovary on the ventral side, and thence 

 proceeds at first forwards, then turns backwards, and then again 

 proceeds forwards, undergoing more or less convolutions on the way, 

 and is finally continued into the ootijp, which opens into the genital 

 atrium by means of a short duct, the uterus (cf. fig. 6, PI. XXYI). 

 Vitellarium extending from the level of the front end of the pharynx 

 to the front end of the posterior sucker; the lobes of the two sides 

 intermingled with each other behind the testes. Paired yoUc-ducts 

 directed transversely to the long axis of the body, that of the right 

 side longer than its fellow of the opposite side; the two therefore unit- 

 ing with each other on the left side of the ovary and there forming a 

 capacious, globular yolk-reservoir, from which a short unpaired yolk-duct 

 leads into the oviduct. Vaginal opening on the left side of the bod}', 

 about midway between the common genital opening and the front 

 end of the testes, surrounded by a mass of compact connective tissue. 

 Testes large, ellipsoidal, paired, just behind the ovary. A single vas 

 efferens arising from each testis, and uniting just in front of the testis 

 of the left side. The vas deferens thence proceeds forwards with nu- 

 merous complicated convolutions as represented in fig. 6, PI. XXVI, 

 and traversing the whole length of the penis finally opens at its apex. 

 With a pair of small globular bodies Ixhind the testes. Prostate gland 



