EELMINT no LOGICAL NOTES.— JOHNSTON. 



193 



straight until it approaches the ovary when it becomes slightly sinuous and its 

 lumen widened to constitute a receptaculum seminis. It passes between the 

 ovarian bridge and the shell-gland. It forms a loop and is joined by the oviduct. 



Fig. 15. — T.S. across posterior half of a segment. 



The fertilising duct passes back below the vagina as a narrow tube and then 

 travels forwards and upwards to penetrate the shell-gland. The point of entry 

 of the vitelline ducts was not observed (figs. 16, 18). 



Fig. 16. — T.S. across female complex. Lettering as in preceding figures. 



The uterus is at first a narrow canal but its walls soon become thrown 

 into irregular sac-like folds. The organ lies in the ventral part of the medulla 

 just above the ventral layer of longitudinal muscle, but below the vagina and 

 vas deferens. It extends almost to the anterior end of the segment. Whilst 

 immature the uterine walls are relatively thick when compared with the vagina 

 (fig. 17). Uterine pores were not observed. Uteri with ripe eggs were found 

 to be restricted to the inner zone of the proglottids. 



The vitelline follicles are small, very numerous glands, occupying a 

 restricted zone laterally to the testes, and extending along practically the whole 

 length of the segment. 



Ripe eggs possess apparently two shells and measure about -025 mm. in 

 diameter, the oncosphere being about -012 mm. in diameter. 



