76 ECONOMIC ZOOLOGY AND ENTOMOLOGY 



finally to the central nervous system. In the brain it grows 

 rapidly to the size of a hazelnut, or larger, the sheep, of course, 



FIG. 23. The gid parasite, Multiceps multiceps, in bladder- worm stage 

 from brain of sheep. (Much reduced; after Hall.) 



suffering from the movements of the parasites and their 

 presence in the brain. The infected sheep usually dies and 

 when its brain infested with the "bladder-worms" is eaten by 



FIG. 24. Adult gid tape-worm, Multiceps miiHiceps, from the intestine 

 the dog. (Natural size; after Hall.) 



a dog or some other carnivore many more tape-worms are 

 produced in the new host. 



