FASCIOLA 



163 



for some time this colouring matter is dissolved out. From each yolk- 

 gland there passes a minute yolk-duct and these join together to form a 

 main yolk-duct running along the zone of yolk-glands near its inner 



s.g: 



v.d. 



McL 



yd. 



-T. 



yg 



Fig. 76. 



Fasciola hepaiica — genital organs, seen from the ventral side. 0, Ovary ; p, penis ; v.s, ventral 

 sacker ; s.g, shell-gland ; T, testis ; U, uterus ; v.d, vas deferens ; y.d, yolk-duct ; y.g, yolk-glands. 



margin. Just about the level of the hinder end of the ovary a trans- 

 verse yolk-duct (y.d) starts off from the longitudinal duct, passes to the 

 middle line, and is continued into its fellow. Where the two meet they 

 are continued directly forwards as a short median yolk-duct which at its 



