182 



EMBRYOLOGY 



0^v;5S/T*i,^-<.*^vy. 



Fio. 80. — A to G, course of development of Distomvw licqynU'cinii (after Lkuckart) : 

 ^, larva with e.ye-spot (^), with gaiij,'lioii lying under it and germ cells (h'2); B, 

 young sporocyt't, with masses of germ cells inside of it, from the respiratoiy cavity 

 of the snail ; C, older sporocyst, with young Rediro ; D, Redia, with Redire and 

 perm balls inside of it, from the liver of the sj)ail ; E, Redia, with Cercaria^ 

 and germ balls, from the liver (jf the snail; F, free-swimming Cercaria; G, 

 young liver-fluke from the bile-duft of the sheep, with branching of the in- 

 testine already liegun. A, eye-spot ; D, intestine ; Ih-, glandular mass on either 

 side of the body of the Cercaria; Ex-, excretory system; G, birth aperture of 

 the Redia; Ar, germ cells ; N, nervous system. 



