380 Animal Biology 



Mouth 



Excretory pore 



Pharynx 



iJii 



Excretory tubes _ _ ^___ 



Intestine 



Muscles _ 



Epiderm is _ 



qcnital pore 



Vaqi'ma 



v/Qs deferens . 



Tejt'i^ 



- -Uterus 





• I 



Seminal vesicle 



Ovary Anus 



Penial setae 



Ejaculatory duct 



Rectum 



Sac containincj setae — ^ 



\ 



'> 



/ 



Male 



female 



Fig. 184. — The parasitic human roundworm, Ascaris lumbricoides, phylum Nema- 

 thelminthes, dissected to show internal structures. 



