THE MANDIBLES AND MAXILL.E. 



171 



ridge is continued into a process by which the mandible 

 articulates with the epistoma (fig. 47, A, ar). The endo- 



ar 



en. 



exp. 



Fig, 47. — Astacnsfluviatilis. — A, mandible ; B, first maxilla ; C, second 

 maxilla of the left side ( x 3), ar, internal, and ar\ external 

 articular process of the mandible ; hj), basipodite ; cxp, coxopodite ; 

 en, endopodite ; p, palp of the mandible ; sg, scaphognathite ; .r, 

 internal process of the first maxilla. 



podite is represented by the three-jointed^aZp {p), the 

 terminal joint of w^hich is oval and beset with numerous 

 strong setse, which are especially abundant along its 

 anterior edge. 



