PARASITOLOGY. 195 
segment; when the segment is full of mature ova it 
ruptures and the ova escape; the segment now 
shrinks, which gives the posterior extremity of the 
worm an attenuated appearance. 
Life Cycle.—The ovum hatches a six-hooked em- 
bryo, which is covered with cilia; by means of the 
cilia it is enabled to move about in the water in 
quest of an intermediate host, which is a fish; in the 
fish it develops into the cystic or larval form, called 
the plerocercoid. Man eating the fish infested with 
the live plerocercoid develops the adult Bothrioceph- 
alus Latus. 
Animal Intested.—Adult infests man; larva infests 
fish. 
farts Intested.—The adult infests the smal! intes- 
tines. The larval or cystic form infests the flesh of 
fish. 
