0^^^W,^•^:^.^. 



Fig. 89.—^ to G, course of development of IHstomum Jiepaticum (after Leuckabt) : 

 A, larva with eye-spot {A), with ganglion lying under it and germ cells (Ez) ; B, 

 young sporocypt, with masses of germ cells inside of it, from the respiratoiy cavity 

 of the snail ; C, older sporocyst, with young Redi«; D, Redia, with Redise and 

 germ balls inside of it, from the liver of the snail ; E, Redia, with Cercariae 

 and germ balls, from the liver of the snail ; F, free-swimming Cercaria ; Cr, 

 young liver-fluke from the bile-duct of the sheep, with branching of the in- 

 testine already Ijegun. -4, eye-spot ; J), intestine; J)r, glandular mass on either 

 side of the body of the Cercaria; Ex, excretory system; G, birth aperture of 

 the Redia; Kz, germ cells; N, nervous system. 



