54 



The st^nriiieuts dose to the scolex are ' 

 .small aud immature, further away 

 they are larger and more developed, 

 at the end of the chain they are ma- 

 ture or ripe. The I'ipe segments are > 

 detached from time to time and pass > 

 into the contents of the intestinal t 

 caral and escape from the body g 

 with the faeces. These mature seg- ^ 

 ments are provided with contractile*^ 

 fibres in their walls and are able to % 

 move about. They contain eggs, 'i' 

 Their life outside of the animal in S" 

 which they are developed is short, and | 

 when they die and break open the | 

 eggs escape. If these fall in a damp | 

 place, they retain their vitality and i 

 power to mature for a long time, in 5 

 some cases many months. | 



A remarkable and interesting fact •§ 

 in connection with the life history of 1. 

 the tapeworm is that the eggs will not ' 

 develoj) into mature worms in the 

 body of an animal belonging to the 

 species of the one in which they were 

 produced. It is necessary that they should lirsl enter 

 the body of an animal of a different species and there 

 develop into embryos, which pass through the walls 

 of the intestinal canal and i)enetrate to distant parts 

 of the body. Thei-e the embryos remain in a some- 

 what more advanced state of development until their 

 host dies and is consumed by an animal belonging to 

 the species of (he oi-i-inal liosl. 



Tl.is can be illi:.s(i-ati-d by l)riefiv describing the life 



