302 



ZOOLOGY OF THE INVERTEBRATA. 



Fig. 78. — Five stages in the life-history of Fasciola hepatica^ 



all highly magnified. 



A, — The free-swimming embryo. 



B. — The sporocyst, containing young rediae. 



C. — The young redia, the digestive tract shaded. 



D. — An adult redia, a daughter redia, two cercarise, and germs. 



E. — The free cercaria. The figures have the same significance 

 throughout, and are described on preceding page. 



