122 



STAKFISH GALLERY. 



Fig. 10. Fig. n. 





ep. 



Fig. 12. 



Fig. 13. 



Stages in the life-history of the Fluke. 



Fig. 10. Egg of Fluke, sliowing the operculum and the contained yolk-spheres. 



Magnified 340 diaais. 

 Fig. 11. An embryo forcing its way by its boring-papilla (p) into the wall of 



the lung of a Snail (e.^). Magnified about 340 diams. 

 Fig 12. A young H^dia (natural size, \ millimetre or J^. inch) : pi, pharynx ; 



g, contained germs ; jj, characteristic posterior processes of the Redia. 

 Fig. 13. Free-swimming Cercaria, before the commencement of the formation of 



the cyst. Magnified 100 diams. 



