126 ZOOLOG ¥. 
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 
Hustrongylus gigas Rudolphi, the female of which is a 
Fig. 84.~0On- 
yuris vermicula- 
ris. a, male, nat- 
tral size: 6, tle 
same enlarged. — 
After Beneden. 
"Fig. 86. —Trichocephalus dis- 
aia! me Cae” par. a, male, natural size ; 5, 
See tae aioe enlarged; c¢, female, natural 
the nai enlaree at size.--After Beneden. 
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 
