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 Kudolphi, the female of which is a 



Fig. 114.- Ox- 

 yvris vermiciila- 

 ris. a, male, nat- 

 nral size : b, the 

 same enlarged. 

 Afur Ueiiedcn. 



Fig. 115. Oxyurif 

 vrrm-imlaris. a, fe- 

 male, natural size ; b, 

 the same enlarged. 

 After Beneden. 



Fig. 1 1 6. Trichocephalus din- 

 par, a, male, Tiatural size ; t>. 

 enlarged ; e, female, natural 

 Bize. After Bent-den. 



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 



