I — Mouth 

 i-Oral sucker 

 Pharynx 



U^«^"* Mehlis' gland |-Yolk duct 



■Sperm duct 



■Yolk gland 

 ■Testis 



Ventral sucker 

 Ovary 



Excretory 

 pore 



Intestine 

 "Lourer's canal 



•Ootype ADULT TREMATODE FROM BILE DUCTS 

 OF SHEEP, MAN, AND OTHER ANIMALS 



Eggs develop, 

 miracidia hatch 

 and burrow 

 into snails 



ENCYSTED STAGE 

 (METACERCARIA) 

 Dissected free 

 from cyst 



Cercariae emerge 

 and encyst ^•^^•* 

 on plants 



OJI 



CERCARIA 



MIRACIDIUM 



Germ ball 



REDIA FROM 

 SNAIL 



REDIA FROM 

 SNAIL 



SPOROCYST 

 FROM SNAIL 



140 



Figure 73. Life cycle and structure of the liver fluke of sheep, Fasciola hepatica. 



