en,. 4-' 



ctrt. fft. 



FiG. 85. A leg of the Fresh-water Crayfish with part of the exo- 

 skeleton removed to show the muscles. 



en. 2-en. 5, segments of endopodite ; h, hinges ; art. /, articular 

 membrane ; ext, extensor muscles ;y?, flexor muscles. 



(From Parker and Haswell's Zoology.) 



