168 



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. 114. Ox- 

 yuris vermicula- 

 ris. a, male, nat- 

 ural size ; b. the 

 same enlarged 

 After Beneden. 



Flee. \\>. 

 fifmncHlnris. a, fe- 

 male, natnr.'il size ; b, 

 the same enlarged. 

 After Beneden. 



Fig. 1 16. - Trichocephalm dis- 

 )>cr. a, male, natural size ; k, 

 enlarged ; r, female, natural 

 size. After Benuden 



metre (about 30 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 



