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of the body. The testes are often adjacent with tbeir edges. 

 The genital aperture is anterior to the ventral sucker, it lies 

 on median line of the body, immediately behind the bifurcation 

 of the intestine. Bursa cirri is very small, slightly overlapping 

 the anterior edge of the ventral sucker with its posterior 

 part (dorsally). The spherical even- edged ovary is situated 

 medially in the space between the anterior testis and the 

 A'entral sucker. 



The vitelline glands are situated on the sides of the pos- 

 terior part of the body. They commence at the level of the 

 anterior margin of the anterior testis and continue backwards 

 to the end of the body. They are arranged not only laterally 

 to the intestinal trunks, but also medially to the latter. The 

 vitelline follicles are grouped in such a manner as to form 4 

 longitudinal bands running parallel to each other (2 bands 

 on each side of the body). In the posterior end of the body 

 the viteUine glands of the right side of the body join those 

 of the left side so that the borders between the aboveraentio- 

 ned bands are obliterated. Tw^o vitelline ducts lead from the 

 anterior portions of the vitelline glands toward the median 

 line of the body, w here they unite to form the yolk reservoir. 



The uterus is very w^eakly developed: wuth its few con- 

 volutions it occupies the space betw^een the posterior edge of 

 the ovary and the external genital aperture. Thus, part of 

 the uterus is twisted dorsally to the ventral sucker, its loops 

 in some places intersecting with the left intestinal trunk and 

 projecting beyond its exterior margin. In none of the speci- 

 mens investigated by me were there any eggs in the uterus, 

 on account of which I can give no data on their form, or 

 dimensions. As concerns the accessory genital organs, I may 

 point out the presence of a receptaculum seminis Avhich is 

 of an irregular oval shape and situated with its long axis 

 transversely with respect to the length of the body in the 

 space between the ovary and the anterior testis. 



The most characteristic organ of this parasite is its Laurer's 

 canal, distinguished by its extreme length and original situa- 

 tion. It begins in the area of the median body-line behind the 

 ovary and forms several convolutions running anteriorly and 

 to the right body-margin of the parasite. Here, on the very 

 margin of the body, at a distance of 2 mm. from the anterior 

 extremity the Laurer's canal opens to the exterior. 



