56 I. IJIMA. 



segmentation of the body such as Baelz mentions. 



Among the vitellarium, branclied efferent dacts filled with yolk- 

 cells may be seen here and there. From the hind portion of the organ 

 a main efferent duct (vit. d.), one from each side, proceeds posteriorly 

 and towards the median line over the intestine. Above the ovary the 

 two ducts meet, and from this point a short unpaired duct descends 

 ventrally and opens into the oviduct at the place already indicated. 



The Uterus (?(i.) makes manifold convolutions in the region 

 bounded laterally by intestinal tubes and situated between the ovary 

 and the ventral sucker. The approximate number of uterine loops 

 along the lateral border varies from 16 to 24. On account of in- 

 numerable eggs contained within, the uterus forms, as is generally the 

 case, a most conspicuous, organ. The eggs have in the anterior portion 

 a dark-brown color, which gradually passes into brown in the middle 

 and then into white in the posterior portion of the uterus. The anterior 

 and much narrowed end of the uterus passes over the ventral sucker and 

 opens externally just in front of the latter on the ventral median 

 line. This opening, which is minute and not recognizable except 

 in sections, is the genital pore common to both male and female pro- 

 ducts. Two distinct sexual openings have been described, but this 

 must be an error. . . 



There are always two testes ( t.) situated in the hind quarter of 

 the body. They lie one after the other, ventrally to intestinal tubes. 

 Their shape is varying, being irregularly lobed or branched. One 

 mi'-'-ht estimate the number of main lobes at 6 or 7. Each testis sends 



o 



out a very fine vas deferens (v. d. fig. 2) from its central portion. The 

 vasa deferentia run anteriorly above the seminal receptacle and the 

 uterus but beneath the transversal efferent ducts of the vitellarium. 

 At about the middle of the region occupied by the uterus and above 

 it the vasa deferentia unite and form a single duct {v. d. fi.ij. 1) of a 



