THE MANDIBLES AND MAXILLA. 171 
ridge is continued into a process by which the mandible 
articulates with the epistoma (fig. 47, A, ar). The endo- 
Fig. 47.— Astacus fluviatilis —A, mandible ; B, first maxilla ; C, second 
maxilla of the left side (x 3). a, internal, and a’, external 
articular process of the mandible ; dp, basipodite ; cap, coxopodite ; 
en, endopodite ; », palp of the mandible; sg, scaphognathite ; z, 
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 sete, which are especially abundant along its 
anterior edge. 
