««..#'- 



/^- 



.ext- 



en.-i-—\ 



. cert, fn. 



erv.3- 



ctri.m,- 



-ext 



'in-.R 



Fig. 85.— a leg of the Fresh-waler Crayfish with part of the exo- 

 skeleton removed to show the muscles. 



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

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



(From Parker and Has well's Zoology.) 



