174 The Farmer'' s Veterinary Adviser. 



sun. A piece of cloth extended across beneath the jaws 

 is often employed to protect this part. 



Rat-tailed maggots the larvae of lidopMlus are also found 

 in horses' intestines but are not known to be injurious. 



23. 



Fig. 23 — Helophilus. 



INTESTmAL WORMS. 



These are arranged in four classes : 1. The tape-worms, 

 consisting of flat bodies made up of a succession of seg- 

 ments or links, with a narrow neck and small head, and 

 divided into tape-worms proper, which are round-headed, 

 and bothriocephah, which are flat-headed with lateral 

 openings ; 2. the flukes, soft-bodied, flattened, leaf-hke or 

 ovoid worms, with digestive organs and a variable num- 

 ber of sucking discs ; 3. the thorn-headed ivorms, with long 

 rounded bodies and retractile snouts furnished with 

 hooks by which they attach themselves to the mucous 

 membrane, but neither mouth nor digestive canal ; 4. 

 lastly, the round worms which diflfer from the last in the 

 absence of a protractile, hooked snout and the pos- 

 session of mouth and digestive canal. The horso 

 harbors in his intestinal canal at least three tape- 

 worms and seven round worms ; the ox, two tape-worms, 

 two flukes and five round worms ; the sheep, one tape- 

 worm, one fluke and seven round worms; the pig, one 

 thorn-headed worm and five roimd worms ; the dog, thir- 

 teen tape-worms, one fluke and five round worms ; the eat, 

 five tape-worms, three flukes and three round worms ; the 

 rabbit, one tape-worm and three round worms ; the goose 

 and duck, nine tape-worms, seven flukes, one thorn-headed 

 worm and seven round worms ; the chicken, four tape- 

 worms, two flukes and seven round worms ; and the tur- 

 key and pigeon, at least two round worms each. Of these 



