THE MANDIBLES AND MAXILLAE. 



171 



ridge is continued into a process by which the mandible 

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



«/; 



cjcp, 



-Sff. 



Fig. il .—Astacns fluviatilis.—k. mandible ; B, first maxilla ; C. second 

 maxilla of the left side ( x 3). ar, internnl, and a/, external 

 articular process of the mandible ; hp, basipodite ; cxp, coxopodite ; 

 en, endopodite ; p, palp of the mandible ; sg, scaphognathite ; a-, 

 internal process of the first maxilla. 



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

 terminal jomt of which is oval and beset with numerous 

 strong, setse, which are especially abundant along its 

 anterior edge. 



