Parasites and Parasitic Diseases of Sheep. AT 
has been found experimentally to re- 
move about two-thirds of the hookworms 
present, and petroleum benzine (a high- 
grade gasoline) has been found to re- 
move about three-fourths of the worms 
when given in doses of a half-ounce in 
milk. In view of the greater safety in 
the use of chenopodium, this remedy 
seems preferable. A second treatment 
may be given after a lapse of two weeks. 
The copper-sulphate and tobacco solu- 
tion recommended for tapeworms has 
also been recommended for hookworms. 
Prevention.—Pasture-rotation meth- 
ods, as outlined under the subject of 
stomach worms, will be found of great 
value in controlling sheep hookworms. 
Proper disposal of the manure, which 
carries the eggs of the worm, is also im- 
portant. -In view of the fact that this 
worm possibly enters the sheep through 
Fic. 29.—Thread-necked strongyle 
(Nematodirus spathiger). Male, 
greatly magnified. (From Ran- 
som, 1911.) 
the skin of the legs as well as through the mouth while the animal 
is grazing, boggy land and loose, wet, sandy soil may be looked on 
Fic. 30.—Thread-necked strongyle (Ne- 
matodirus spathiger). Female, greatly 
magnified. (From Ransom, 1911.) 
with suspicion as apt to convey the 
infection by bringing the larve in 
contact with the skin in mud or 
wet sand. 
THE THREAD-NECKED 
STRONGYLES.”” 
Location.—The thread-necked 
strongyles are found in the small 
intestine. 
Appearance.—These are slender 
worms, the anterior portion more 
slender than the posterior. The 
head and the neck end are trans- 
versely striated. In WV. spathiger 
the male worm attains a length 
of 1.5 cm. (2 inch). The female 
attains a length of 2.3 cm. (about 1 inch). 
Life history.—The eggs produced by the female worm pass out in 
the feces and anembryo develops in them. This worm molts twice in 
°° Nematodirus filicollis, N. spathiger, ete. 
