4 XI 



XII 



XVI 



XIX 



Fig. 84. Appendages of the crayfish (Cambarus), from the left side. 



(Natural size) 



1, protopodite; 2, endopodite ; 3, exopodite; h, epipodite with gill filaments; 

 5, gill with gill filaments. (I, II, III, etc., stand for the number of the somite in 



the animal's body) 



