374 Animal Biology 



Mouth 



Pharynx 



Esopha(jus 



__;nfcc5t?n<? 



. Excretory 



canal 



-.Pharynx 

 —Nerve rinq 

 --Esophacjus 



vesiclQ 



Ovary &. 

 duct 



Openincj of excretory 



Mouth 



Penis^ withaP^r. 



^ Vaccina tures 



2X Uterus 



Longitudinal 

 ^nerve 



Jhcll Cjland 

 .Sperm duct 



-Anterior 

 testes 



.-Posterior 

 testes 



-Yolk qlands 



Fig. 180. — Liver fluke (Fasciola hepatica) of the phylum Platyhelminthes. 

 A, Digestive system; B, excretory system; C, nervous system; D, reproductive sys- 

 tem. All are much enlarged and somewhat diagrammatic. 



