3 22 



THE CRAYFISH 



LESS. 



en* 3 



O.Copul^ory Organs 10. Swimming Foot 



FIG. 82. The principal appendages of the Fresh- water Crayfish 

 placed in the same position, with the protopodite (pr) and epipodite (ep] 

 downwards, the endopodite (en) to the left, and the exopodite (ex) to 

 the right. 



The protopodite is typically formed of two podomeres (pr, i, pr. 2), 

 the endopodite of five (en. i-en. 5) : a gill (g) may be attached to the 

 epipodite and a bunch of long setae to the protopodite (7 and 8). 



The three segments of the antennule are marked 1-3, its flagellay?. I 

 and fl. 2 : at the distal end of the endopodite of the antenna is a 

 flagellum (fl}. 



(From Parker and HaswelPs Zoology, after Huxley.) 



