322 



THE CRAYFISH 



5. Z'^MaxilU e.l^Maxillibed ^ ^^^^ ""5* 



7. 3':'M«xilliti«d 



8. 3'.'' Leg 



prf 

 OXopulaFory Organs lO.SwImmlngFoor 



Fic. 82. — The principal appendages of the Fresh-water Crayfish 

 placed in the same position, with the proiopodite(/^) and epipodite {ep) 

 ilownwards, the endopodite {en) to the left, and the exopodite {ex) to 

 the right. 



The protopodite is typically formed of two podomeres {pr. i. //-. 2), 

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

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



The three segments of the antennule are marked 1-3, its flageliayf. i 

 and fl. 7. : at the distal end of the endopodite of the antenna is a 

 flagellum {fl). 



(From Parker and Haswell's Zoology, after Huxley.) 



