d e f 



Fig. 142.— Liver Fluke : a, free swimming ciliated larva ; &, young 

 ^orocyst, a few days after migration into the snail ; c, sporocyst, 

 containing redisa in various stages of development ; d, redia, con- 

 taining balls of germinal cells ; e, mature redia, containing its brood 

 of cercariae ; /, mature cercaria ; g, .iust-encysted cercaria ; h, young 

 fluke, soon after entering sheep ; i, the water snail, LymncBus trunca- 

 tulus. 



a, l>, c, d X 200 ; e X 150 ; / X 300 ; g X 150 ; 7i X 25 ; i, natural size and 



