6 CIRCULAR 148, U. S. DEPARTMENT OF AGRICULTURE 
three-fifths of an inch to over 3 inches long. It occurs usually in 
the cecum and is also found in the lower portion, rarely in the 
upper portion, of the small intestine. This species is apparently 
much less common in American horses than the other two species 
of tapeworms. 
Symptoms and lesions——In light infestations no symptoms are 
present. Horses which are heavily infested with tapeworms may 
FIGURE 1.—AlImost a gallon of large tapeworms, Anoplocephala magna, removed post- 
mortem from a horse. About one-half natural size. (Photograph by courtesy of 
the Agricultural and Mechanical College of Texas) 
suffer from intestinal catarrh, show digestive disturbances of vari- 
ous sorts, and in cases of very severe infestations they may become 
emaciated and anemic. The perfoliate tapeworm of the horse 
often occurs in large numbers when present at all, and is said to 
produce inflammation of the intestines; sometimes it ruptures the 
wall of the cecum. The attachment of tapeworms of this species 
to the wall of the cecum produces small ulcers 
in the regions to which the worms are attached. 
Treatment.—Very little is known regarding 
treatment for tapeworms in the horse. The fol- 
Ficurp £—The dwarf lowing treatments have been recommended but 
EO nitine <= ~have not had critical test to determine their pre- 
phala mamillana, of : 
the horse. Natural cjse value. 
i Oil of turpentine is said to be an effective 
remedy. This is given in a dose of 2 fluid ounces (60 cubic centi- 
meters) in capsules, followed every second day by 1 ounce (30 cubic 
centimeters) in capsule until five or six doses have been given. The 
last dose is immediately preceded or followed by 1 quart of raw 
linseed oil. It would seem that the drugs used for the treatment of 
tapeworm infestation in other animals would offer more promise. 
a 
