TANIA SOLIUM. 193 
worm consists of a small head attached by a short neck to 
a relatively large bladder. 
Fic. 100.—Life history of Zenza solium.—After Leuckart. 
x. Six-hooked embryo in egg-case; 2. proscolex or bladder-worm 
stage, with invaginated head ; 3. bladder-worm with evaginated 
head ; 4. enlarged head of adult, showing suckers and hooks ; 
5. general view of the tape-worm, from small head and thin 
neck to the ripe joints; 6. a ripe joint or proglottis with 
branched uterus (cf. Fig. 99); all other organs are now lost. 
When man unwittingly eats ‘“‘ measly ” pork—that is, pork 
infested with bladder-worms—an opportunity for further 
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