84 
canal of the horse they get into the small vessels of the gut, and pass on into 
the large arteries, and becoming embedded in the walls of these larger blood 
vessels, they cause bulgings termed aneurisms. Lastly, these parasites 
make their way out of the vessels, and thence endeavour to make for the 
large gut, where they again change their skins, and, adhering to the mucous 
lining of the bowel by means of their spines, attain sexual maturity. 
YF MK0N 
é| — A 
ANEURYSMAIL ARMED STRONGYLE. 
1, male, natural size; 2, female, natural size; 3, anterior extremity, highly 
magnified ; a, complete buccal capsule ; b, cesphagus, or gullet; c, intestine. 
4, caudal extremity of the male worm; A, hook and accessory 
part. (Rayer). 
The ancurysms or swellings occur in a large percentage of horses and 
asses, and they vary in size from a pea to a man’s head, and are met with in 
animals six months old and upwards. The number of worms inan aneurism 
varies, and is usually nine to ten, the highest number in one horse being 121- 
It has been said “that foals and yearlings suffer more from parasites in the 
paddocks, than they do on adjoining farms where only a few animals are 
bred.” “This is explained,” says Dr. Cobbold, “by the relatively greater 
amount of egg dispersion proceeding from the infected brood mares. It is- 
quite evident that the lives of many valuable animals are annually sacrificed 
by the neglect of hygienic arrangements. The palisade worm, as this 
parasite is commonly called, is chiefly destructive to young animals, and, as 
Mr. Percivall has remarked, is commonly the cause of lingering and hidden 
disease terminating in death, without any suspicion on the part of the 
practitioner as to the nature of the malady.” Treatment for these avorms is 
not of much value. 
We have lastly to speak of the common hydatid of the horse. It is well 
known that after death hydatids (Echinococed veterinorum) axe: 
sometimes found in the various organs and glands of the horse, more 
especially in the lungs, liver, and kidneys, and sometimes in the brain. 
