92 VETERINARY PARASITOLOGY 
The length varies from ro to 20 yards. The head is 
lanceolate in shape, and in place of suckers carries two 
long canals, or bothria. The segments are much wider 
than long. When ripe, the terminal segments shrivel 
and remain attached for a while. They are practically 
empty of ova. In this worm actual ovulation takes 
place, the eggs being extruded from the central opening. 
The intermediate host is a perch or pike. This worm 
Fic. 26,—T#NIA CUCUMERINA. Fic. 27.— BoTurRio - 
CEPHALUS LaTUS. 
may inhabit the intestine of man or the dog in countries 
where sanitation is neglected and sewage drains into 
lakes or rivers. 
Mesocestoides Lineatus also has the suckers centrally 
placed in each segment. It is much shorter, only 
averaging 18 inches in length. The segments resemble 
those of Tenia cucumerina. Instead of bothridia, 
Mesocestoides lineatus has four ordinary suckers, opening 
by slits. 
Life-history not fully worked out. 
