66 



STARFISH GALLERY. 



Fiff. 43. 



Fie. 44. 



SBR' 



. 



Fiff. 40. 



Stages in the life-history of the Fluke. 



Fig. 43. Egg of Fluke, showing the operculum and the contained yolk- 

 spheres. Magnified 340 diams. 



Fig. 44. An embryo forcing its way by its boring-papilla (p) into the wall of 

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



Fig. 45. A young Redia (natural size, \ millimetre or 3 y inch) : pi, pharynx ; 

 g, contained germs ; p, characteristic posterior processes of the 

 Redia. 



Fig. 46. Free-swimming Cercaria, before the commencement of the formation 

 of the cyst. Magnified 100 diams. 



