210 MANUAL OF ELEMENTARY ZOOLOGY 



joint fertilises itself. From time to time the last proglottis 

 breaks off, singly or with others, and passes out of the 

 intestine to the exterior. It has some power of independent 



Fig. 129. — The life-history of Tama solium. — After 

 Leuckart. 



. 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 tapeworm, from small head and thin 

 neck to the ripe joints; 6. a ripe joint or proglottis with branched 

 uterus ; all other organs are now lost. 



