240 S. GOTO. 



eating lateral branehes on the outer side and a smaller number (about 

 four or five) of less repeatedly dividing branches on the inner. 

 The foremost inner branches of both sides form a pair, and pro- 

 ceed at first backwards and to-wards the median line and then again 

 diverofe, thus making: the fiofure of two bows with their backs turn- 

 ed towards each other ; the branches of the two sides being, however, 

 often of unequal lengths. Common (jenital opcnimj close behind the 

 anterior sucker of the left side. Penis club-shaped, of moderate length. 

 Ovary much lobed, in the* median line, at the beginning of the middle 

 third of the bod3\ Oviduct arising from the ventral side of the an- 

 terior end of the ovary, proceeding forwards and towards the left dorsal- 

 ly to the yolk-duct, continued into the ootyp about midway between 

 the hinder end of the penis and the front end of the vitelline reservoir. 

 Uterus of moderate length, following the same general course as the 

 oviduct, opening into the genital atrium at a short distance from the 

 external opening of the latter. Yitelhrium almost wholly confined to 

 the lateral and posterior regions of the body, but also following the 

 intestinal branches into the median region ; with a large yolk-duct just 

 inside the intestinal trunk on each side ; this yolk-duct, by its union 

 with a similar duct coming from the anterior part at the plane of the 

 front end of the ovary, gives rise to the paired yolk-duct, which unit- 

 ing with its fellow of the opposite side at the fi-ont end of the ovary 

 on the left side of the median line, forms here a large yolk-rescrvoir. 

 From this the unpaired yolk-duct proceeds dorsad, anteriad, and towards 

 the right, and opens into the oviduct. Vaginal opening a short dis- 

 tance behind the common genital opening, a little farther from the 

 median line ; the much convoluted vaginal canal lies for the most part 

 just outside the vas deferens, is swollen into a comparatively small 

 receptaculum seminis near its external pore, and finally opens into the 

 yolk-reservoir. Testes small, very numerous, confined to the median 



