i68 



UNSEGMENTED " WORMSr 

 2 3 



FIG. 54. Life history of Liver Fluke. (After THOMAS.) 



i. Developing embryo in egg case; 2. free swimming ciliated 

 embryo ; 3. sporocysl ; 3. Lymncea truncatula ; 4. division of 

 sporocyst ; 5. sporocyst with rediae forming within it ; 6. redia with 

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



