4 XI 



FIG. 68. Appendages of the Crayfish (Cambarus affinis), from the 



left side. Natural size. 

 (I, II, III, etc., stand for the number of the somite in the animal's body) 



1, protopodite; 2, eudopodite; 3, exopodite; 4, epipodite with gill-filaments; 

 5, gill with gill-filaments 



129 



