CHAPTER XXII 



WORMS. 



The commonest round worm infesting^ the horse is that 

 known as ascaris megaloccphala, which varies in its length. It 

 is cream coloured, has faint self-coloured and transverse stripes. 

 It is only when these worms are very numerous that they cause 

 the animal to fall off in condition. 



Another round parasite is that known as the palisade 

 worm (strongylus armatus), whose abode is in the blood vessels 

 and bowels as well. 



The wandering nature of these parasites renders their 

 presence particularly objectionable. Their average length is 

 about one inch and a quarter. 



The four spined strongyle (strongylus tetr acanthus) is a true 

 blood-sucking worm. When fresh they are bright red in colour. 

 They are usually found adhering to the pellets of dung. Part 

 of their life history is spent in the wall of the gut, which they 

 are liable to perforate to serious consequences. 



The pin worm (oxyuris curvula) takes up its abode at the lower 

 end of the bowel (rectum). 



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