166 



THE MORPHOLOGY OF THE COMMON CRAYFISH. 



The second maxillipede (fig. 45, B) has essentially the 

 same composition as the first, hut the exopodite {ex) is 

 relatively larger, the endopodite (ip — dp) smaller and 

 softer; and, while the ischiopodite (ip) is the longest 

 joint in the third maxilhpede, it is the meropodite (mp) 

 which is longest in the second. In the first maxillipede 



Fig. 45. — Astaem fluviatilis. — A, the first ; B, the second maxillipede 

 of the left side ( x 3). cxp, coxopodite ; ip, basipodite ; <-', br, po- 

 dobranchia ; ep, epipodite; en, endopodite; ea;, exopodite ; ip, is- 

 chiopodite ; mp, meropodite i ep, oarpopodite ; pp, propodite ; dp, 

 dactylopodite, 



(fig. 45, A) a great modification has taken place. The 

 coxopodite (cxp) 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 



