406 



ZOOLOGY. 



bility, but has generally a consistence resembling horn. It 

 is not horny, however. A substance called chiline forms the 

 base. It is composed of several pieces, so united as to admit 

 of motion. 



The body, as already described, is composed of rings or 

 segments placed in a pile; and in this series of segments 

 three portions are distinguished, the head, thorax, and 

 abdomen. 



Head. 



Tarsus. 



Fig. 416. Anatomy of the Tegumentary Skeleton of a Grasshopper. 



The members or appendages connected with these different 

 rings have a structure analogous to the trunk of the animal ; 

 they are composed in fact of solid tubes or horny plates, en- 

 closing in their interior muscles and nerves intended to move 

 them. - 



