THE MANDIBLES AND MAXILLiE. 



171 



ridge is continued into a process by which the mandible 

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



FlG. 47. — Astacusfluviatilis. — A, mandible ; B, first maxiJla ; C. second 

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

 articular process of the mandible ; tp, basipodite ; exp, coxopodite ; 

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

 internal process of the first maxilla. 



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

 terminal joint of which is oval and beset with numerous 

 strong setse, which are especially abundant along its 

 anterior edge. 



