370 



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. 



Limbs of the 

 Third Pair. 



Leg 



Tarsus. 



Fig. 338. Anatomy of the Tegumentary Skeleton of a Grasshopper. 



The members or appendages connected with these different 

 riiiijs have a structure analogous to the trunk of the animal : 

 tln-y are composed in fact of solid tubes or horn}'. plat 

 closing in their interior, muscles and nerves intended to move 

 them. 



The head is formed of a single segment, and carrirs tin- 



