I. CRUSTACEA: DEC APOD A. 



435 



ASTACOiDEA. Carapace crossed by a transverse groove. The Astacid^ 

 have well-developed chelte. Cumharus * includes the crayfish of the 



A B 



Fig. 444.—^, Crangon vulgaris *; B, Pandxdus moyitagui* 



Fig. iA5.—Eupagurus bernhardus, hermit crab. (From Emerton.) 

 eastern states; those of the Pacific coast and Europe belong to Astacus* 

 The lobsters belong to Homarus.^ Palinurid^e (Loricata), no chelae, 



