79 VETERINARY PARASITOLOGY 
To detect the presence of these worms after death, the 
abomasum or a piece of intestine should be opened and 
emptied ofits contents. A scraping of the mucous mem- 
brane should then be taken and mixed in a watch-glass 
with water, placed while in this receptacle on the stage of 
a microscope, and examined with a low-power objective. 
A magnification of x50 is ample. If the watch-glass is 
placed on a piece of black paper, in a good light, the 
parasites may be more readily discovered. In addition 
to the adult worms, ova and embryos may be discovered. 
A brief description of the more important of the 
above-mentioned parasites will suffice. 
Strongylus Cervicornis inhabits the abomasum of 
cattle and the intestine of sheep and lambs. 
It causes great mortality—even as high as 20 per cent. 
Its colour is a greyish-white. The male is 7 millimetres 
long. It has a caudal bursa, supported by dichoto- 
mously branched chitinous rays. The female is 
ro millimetres long. 
Strongylus Contortus inhabits the abomasum of 
cattle and sheep. It is of a reddish colour, owing to the 
blood of its host contained within it. 
The male is 10 to 20 millimetres in length, and the 
female ro to 30 millimetres. 
The male has a bilobed caudal bursa, with a small 
unilateral accessory lobe. 
The oviducts of the female are contorted, and wound 
around the intestine. 
Strangylus Filicollis inhabits the abomasum of 
cattle and sheep, and commonly the small intestine. 
The anterior portion is tapered into a neck. 
It is smaller than Strongylus contortus. 
Strongylus MacFadyensis is similar, but smaller. 
Strongylus Convolutus inhabits the abomasum of 
cattle and sheep. The male has a bilobed caudal bursa, 
with four rays in each. 
