ASCAEIDiE AND FILAEID^. 



75 



colour, slightly ridged, and about ten inches long in the $ and 

 six in the male. This worm is common in all Equidce, but 

 only affects seriously young animals. They produce colics and 

 digestive disturbances, and sometimes so obstruct the intestine 

 as to cause death. The ova are nearly globular bodies, and are 

 seemingly introduced 

 into the horse in drink- 

 ing water. A. suilla 

 (fig. 27) 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 pro- 

 duce serious colics. 



Another Ascaris, A. 

 lumbricoides, is found 

 in the human being. 

 A common and often 

 troublesome worm in 

 horses is the " Maw- 

 worm " ; this is one of 

 the Oxijures, which may 

 be told by the posterior 

 end of the oesophagus 

 being enlarged into a 

 spherical bulb Avith a 

 masticatory apparatus. 

 The female is quite un 

 like the male, having 

 her body long, thin, 



and pointed towards one end, wliilst the other is much enlarged 

 and cylindrical. The male is cylindrical, and has no long tail- 

 like process and only one spiculum. The common ]\raw-worm 



FlO. 27. — ASCAHID.G. 



A, Male Asmr^'! sviUa : p., fenmle Ascari'! (after 

 RaiUiet) ; c, caudal extreunty, with spicukc of a ; d, 

 ova ; E and f, oral papillte of a. 



