CLASS VERMES: ORDER PLATYELMINTHES. 240fl 

 Mg. U12. 



Tcenla sofium, Human Tape-worm. 



their way into the blood vessels, are swept to 

 all parts of the system. Entering the organs, 

 they become surrounded by a cyst or crust. 

 When " measly pork," i.e., pork thus infested, 

 is eaten, the vesicle bursts and the worm is 

 rapidly developed.* 



Planaridse (flat-formed). The Planaria 

 is of gelatinous consistency, and not parasitic. 

 Any portion amputated is reproduced in a 

 brief time. 



Fig. 1*13. 



Planoctra 



nebuldsa, 



Planarian Worm, 



magnified double. 



* The life-history of the tape-worm is always the same. Some animal eats the 

 eggs and develops the larvae ; another eats its flesh and develops the mature 

 worm. The other common tape-worm of man is derived from " measly " beef. The 

 tape- worm of the cat comes from the cystic worm of the mouse ; that of the fox from 

 the cystic worm of hares and rabbits ; and that of the dog from the cystic worm 

 which causes the " staggers " in sheep. 



