194 



ZOOLOGY 



out of the snail, attach themselves to damp grass, lose their tails, 

 and encyst thems(>lves. If these cysts be eaten by a sheep, 

 they develop in the sheep's body into an adult liver-fluke 



J)ec.10. 



MarchlSApr.^. 

 Ja.n.25. FAS. Feh. 17 



^) # A 



\) 



\ 1/ Al^/f. 



^ Mai-ch 13 



.Feh.5. ''<*■''' 



J>ec. 10. 



Jan.23: 



Fig. ISS. — Showing results of cutting Planarians into two pieces ; the pieces 

 develop into entire animals. After Morgan. 



(Fig. 189). Thus the stages which we can recognize in the liver- 

 fJuke are : — 



First generation : ce:g from li^•er-f^^^ke, kirva, and adnlt sporocyst. 

 Second generation : redia (this may 1)C several times repeated). 

 Tliird generatioa: "cercaria" larva, cncj^sted larva, and adult 

 liver-fluke. 



