No. 398.] MORTH-AMERICAN INVERTEBRATES. I4I 
B. Carapace with rounding posterior corners. 
C. Posterior of the lateral spines of the carapace exceeding the 
other spines or teeth but little if at all. 
D. Three spines on manus P. anceps (Saussure) M(CHY} 
D’. Two spines on manus. 
E. Superior outer surface of manus smooth, iridescent 
P. ordwayi (Stimpson) G 
E'. Superior outer surface of manus with a longitudinal, 
tuberculated ridge. 
Fic. 5.—Carcinides manas. 
F. Front with eight intraorbital teeth 
P. spinimanus (Latreille) MSG 
F’.. Front with six intraorbital teeth 
P. depressifrons (Stimpson) S 
