86 



ASCARIDiE AND FILAKID/E. 



seeniiBgly introduced into the horse in drinking water. A. suilla 

 (fig. 34) is often found in the pig. The male is from four to 

 six inches long, the female often as much as eight. It is found 

 in the small intestine, and may produce serious colics. 



Another Ascaris, A. 

 JmnhricoitJeg, is found 

 in the human being. 



A common and often 

 troublesome worm in 

 horses is the " Maw- 

 worm " • this is one of 

 the 0.i:[/ures, which may 

 be told by the posterior 

 end of the oesophagus 

 being enlarged into a 

 spherical bulb with a 

 masticatory apparatus. 

 The female is quite 

 unlike the male, hav- 

 ing her body long, thin, 

 and pointed towards 

 one end, whilst the 

 other is much enlarged 

 and cylindrical. The 

 male is cylindricaJ, and 

 has no long tail -like 

 process and only one 

 s'piculum. The common 

 Maw-worm is found in 

 the large intestine of 

 the horse and other 

 EquidfP : it is known as 0.r//un')t curvii/a (fig. .'^."i), and may often 

 be seen hanging from the horse's anus. We ha^•e known these 

 worms cause very seriouB emaciation in horses, but they are easily 

 cleared out by the use of santonin powder. This vennifu^e 



Fio. 34. — Ahcarid.e. 



A, Male Ascaris suilla: h, ffniale Asctiris (aftn- 

 Railliet); c, caudal extremity, with spicul;i' of a; 

 D, ova ; E and f, oral papillif of a. 



