/. CRUSTACEA: DEC APOD A. 435 



ASTACOIDEA. Carapace crossed by a transverse groove. The ASTACID.E 

 have well-developed chelae. Cambarus* includes the crayfish of the 



A B 



FIG. 444. A, Crangon vulgaris *; B, Pandulus montagui.* 



FIG. 445. Eupagurus bernhardus, hermit crab. (From Emerton.) 

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

 The lobsters belong to Homarus* PALINURID^J (Loricata), no chelae, 



