DEVELOPMENT OF DISTOMUM 



219 



Fig. 118. — Life-history of liver fluke. — After Thomas. 



I, Developing embryo in egg-case ; 2, free-swimming ciliated larva ; 

 3, sporocyst ; 3a, shell of LimncBus truncahdus ; 4, division of sporo- 

 cyst ; 5, sporocyst with redis forming within it ; 6, redia with mor 

 rediae forming within it ; 7, tailed cercaria ; 8, young fluke. 



