166 THE MORPHOLOGY OF THE COMMON CRAYFISH. 
The second maxillipede (fig. 45, B) has essentially the 
same composition as the first, but the exopodite (ex) is 
relatively larger, the endopodite (ip—dp) smaller and 
softer; and, while the ischiopodite (tp) is the longest 
joint in the third maxillipede, it is the meropodite (mp) 
which is longest in the second. In the first maxillipede 
Visa. 45.— Astacus fluriatilis.—A, the first ; B, the second maxillipede 
of the left side (x 3). cap, coxopodite ; bp, basipodite ; ¢, b7, po- 
dobranchia ; cp, epipodite; en, endopodite; ea, exopodite ; 7p, is- 
chiopodite ; mp, meropodite ; cp, carpopodite ; pp, propodite ; dp, 
dactylopodite. 
(fig. 45, A) a great modification has taken place. The 
coxopodite (cap) and the basipodite (bp) are broad thin 
plates with setose cutting edges, while the endopodite 
(en) is short and only two-jointed, and the undivided 
portion of the exopodite (ex) is very long. The place of 
