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- 



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

 maxilla of the left side ( x 3). ar, internal, and a¥, external 

 articular process of the mandible ; ij>, basipodite ; carp, coxopodite ; 

 en, endopodite ; p, palp of the mandible ; sg, scaphognathite ; x, 

 internal process of the first maxilla. 



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

 terminal joint of which is oval and beset with numerous 

 strong setffi, which are especially abundant along its 

 anterior edge. 



