PARASITOLOGY. 189 
Animal Intested.—The adult infests the dog; the 
larva infests sheep, and, rarely, cattle. 
Parts Infested.—The adult worm infests the small 
intestines of the dog; the larval or cystic form is 
found in the brain or spinal cord. 
Disease Produced.—Gid; turnsick; sturdy; water- 
brain. 
Symptoms.—A dog infested by the adult worms 
shows the same symptoms as when infested by any 
one of the preceding species, and is amenable to the 
sametreatment. If many embryos become lodged in 
the cranial cavity of the sheep the first symptoms will 
appear about the eighth or tenth day; they cause a 
cerebral congestion which produces dullness; the 
head is held in a drooping position, the eyes are red, 
and the head hot over the affected region; there may 
be spasms and paralysis. If only a few embryos 
are present they will not produce the symptoms so 
quickly; later the sheep keeps apart from the flock, 
the pupils are dilated, and the animal manifests an 
unsteady gait; the animal may turn in a circle, to 
the right or left, depending on which side the cysts 
are developed; if the cysts are in the right hemis- 
phere it will turn to the right; if in the left hemis- 
phere it will turn to the left. The limbs on the 
opposite side of the body are stiff or partially para- 
lyzed; if both hemispheres are invaded the sheep 
may turn to the left, then to the right, depending 
upon which side the greatest irritation exists; if the 
cysts are in the center, in the region of the corpus 
callosum or hippocampus the sheep elevates its nose 
and goes straight forward ; if the cysts are lodged in 
the cerebellum they produce great incodrdination of 
movements; if in the corpus striatum or optic thal- 
