E 



y 



erU:. 



:::g,c. 



Fig. 74. 

 Life-history of Fasciola hepatica. A, "egg"; B, miracidium ; C, sporocyst ; D, E, rediae; 

 F, cercaria ; G, tail-less encysted stage ; E, adult (neither reproductive organs nor nervous system 

 are shown), b.o, Reproductive opening of redia ; c, cercaria ; E, egg ; ent, intestine ; g, nerve- 

 ganglion ; g.c, germ-cells ; g.l, cyst-producing gland-cells ; n, nephridium (only a few of the main 

 branches of the excretory network are shown) ; n.o, nephridial opening ; o.s, oral sucker ; p, proboscis 

 (extruded) ; v.s, ventral sucker ; y, yolk-cell«. 



