126 



ZOOLOGY. 



female is white and from eight to ten millimetres in length; 

 the male is only two or three millimetres long. 



The largest known round worm is the palisade worm, or 

 Eustrongylus gigas Rudolphi, the female of which is a 



\ 



Fig. 85. Oxyitrl* 

 vermicularis. a, fe- 

 male, natural size ; *, 

 the same enlarged. 

 After Beneden. 



Fig. 86. Trichocephalusdis- 

 par. a, male, natural size ; b, 

 enlarged ; c, female, natural 

 size. After Beneden. 



metre (about 39 inches) in length, and the size of a quill ; 

 the male is one third as long. It is rare in man, and occurs 

 especially in the intestines, and sometimes the kidneys of 

 such mammals as live on fish. The mouth is surrounded 



