PARASITOLOGY. 191 
Animals Infested.—The adult infests the dog; the 
larva infests the rabbit. 
Parts Intested.—The adult worm is found in the 
small intestines of the dog; the larva or cystic form 
is found in the peritoneal cavity of the rabbit. 
Symptoms.—The adult form in the intestines of the 
dog produces the same symptoms and is amenable 
to the same treatment as the preceding species; the 
cysticercus pisiformis as a rule do not cause serious 
results in rabbits. 
TAENIA SERIALIS. 
Distribution. — Not common; reported more 
common in European countries. 
Description.—The head is wider than the neck and 
is provided with four sucker discs and a rostellum of 
from twenty-six to thirty hooklets; the neck is long 
and slender ; the segments, at first shorter than broad, 
farther down the strobilus are as long as broad; 
finally the ripe segments are about two and one-half 
times as long as broad; these latter segments are 
narrower at the ends than at the middle. The 
genital pores irregularly alternate. 
Lite Cycle.—The intermediate host is the rabbit and 
rodent, which become infested through water or food 
contaminated with the ova from the dog; in the 
stomach the six-hooked embryos are liberated; they 
migrate to the connective tissue and develop small 
cysts which contain the larve suspended from the 
mother membrane by means of pedicles, which floats 
in a colorless fluid. Dogs become infested by devour- 
ing the carcasses of rabbits or rodents harboring the 
cystic form; the larval or cystic form is called the 
