278 MR. E. M. ROBINSON 



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Haemonchus Contortus, . This parasite, which is prob- 

 ably the most important one of stock in South Africa^ 

 occurs in the abomasum of sheep, cattle and goats. The 

 female is about li inches long, and has a twisted appear- 

 ance due to the intestine containing blood, winding round 

 the oviduct Avhich is not coloured, so that the appearance 

 of a barbers pole is obtained. The male is about an inch 

 long and is red in colour. The common name for the 

 worm is ^' The Sheep Wire Worm ". 



The small intestine of cattle contains a minute hair 

 like worm CoojJeria Oncophwa^ which is very difficult to 

 see in the bowel when opened. The sheep's intestine con- 

 tains a similar small hair like worm, the Trichostrongyhis 

 Instahilis, a worm likely to be of much economic im- 

 portance in the future. The small intestine of the horse 

 contains a large nematode, Ascaris Megalocepliala, which 

 worm may reach a lenght of 15 inches in the female. The 

 colour is yellow and the female is much larger than the 

 male, as is usual in nematodes. The pig's intestine con- 

 tains a closely allied worm, Ascari8 Suilla, which is 

 similar in shape but is whiter in colour, and does not 

 usually attain a length of more than 8 inches. 



The caecum and colon of the horse contain a host of 

 different species of nematodes, and a tapeworm, Taenia 

 Perfoliata, which is about ^ to one inch long, leaf like in 

 shape has no hooks on the head. There is a species of 

 nematode found in the colon of the horse, Oxyuris 

 Ciirvula, which is a white w^orm about 2" long in the 

 female, the only sex easily found, and tapers towards 

 the tail end. The large intestine of sheep and cattle 

 often contains a small round worm, Trichocephaliis Tri- 

 chiuris. This worm has the appearance of a stock whip, 

 the head and a portion of the body being very thin and 

 thread Ifke, and the tail end is thick. The small intestine 

 of the sheep usually cotain-s a nematode, Bunostomum 

 Trigonoccphalus. This worm is a blood sucker, is 

 attached to the mucous membrane and has a well 



