194 PARASITOLOGY. 
Lite Cycle.—Rats and mice become infested 
through food and water, in which animals the cystic 
or hydatic stage develops. The cyst is ovoid in 
shape, about the size of a pea and contains a single 
larva; the cystic form is. called cysticercus fascio- 
laris. 
Animals Intested.—The cat, rat and mouse. 
Parts Infested—The adult infests the intestines 
of the cat; the larval or cystic form, rats and 
mice. 
Treatment.—Same as for dogs, with corresponding 
smaller dosage. 
BOTHRIOCEPHALIDAE. 
This family includes a group of worms which are 
close allies of the tapeworms. The head is oblong 
and is provided with two suckers arranged on the 
sides of the head in the forn: of slits. Each segment 
is provided with one genital pore, which is located in 
the center of the ventral surface. There is one 
genus, viz., Bothriocephalus. 
BOTHRIOCEPHALUS Latus (Bothrida—sucker) 
(Latus—broad). 
Synonym.—Pit-headed tapeworm. 
Distribution. — Found in Japan, Switzerland, 
Holland and other countries. 
Description.—Its head is elongated and followed 
by a long, slender neck; the head is provided with 
two suckers in the form of slits, located on the sides 
of the head; the segments are very short; the widest 
ones reach one-half inch in width. The genital pore 
is located in the center of the ventral side of each 
