132 Bulletin, Vanderhilt Marine Museum, Vol. II 



The eyestalk is short, stocky, with a tongue-like projection on the 

 upper surface of the cornea which is small, spherical, terminal. 

 The antennulae fold almost transversely. 



The antennae have the basal article short, not touching the frontal 

 edge; the second joint barely reaching the front, the flagellum long, 

 fine, situated in the orbital hiatus and extending about to the anterior 

 margin of the first lateral tooth. 



The chelipeds are slightly unequal in both sexes, very massive ; the 

 merus is short, thick, the carpus smooth, convex, with a prominent 

 blunt tooth at the inner angle ; the propodus is very massive with the 

 outer face smooth, convex, its height equal to two-thirds the length 

 of the carapace and its length, including the dactylus, is slightly 

 greater than the length of the carapace ; the fingers are approximately 

 as long as the palm, curved, pointed, the lower finger of the larger 

 claw with a large, trinoduled basal tooth ; the outer half of the finger 

 is very black. 



The ambulatories are comparatively slender, the merus about as 

 long as the carpus and propodus taken together ; the distal half of the 

 propodus and the entire dactyl have a dense tuft of short setae on 

 the upper lateral margin ; the tip of the dactyl is sharp, horn-colored 

 toe-nail, which enables the crab to obtain a purchase in scrambling 

 over the rocks. 

 Synonymy. — Cancer mercenaria Say, Jour. Acad, Nat, Sei. Phila., 



vol. 1, p. 448, 1818. 

 Xantho mercenaria H. Milne Edwards, Hist. Nat. Crust,, vol, 1, p. 



399, 1834. 

 Pseudocarcinus mercenarius Gibbes, Proc, Amer. Asso. Adv. Sci., 



vol, 3, p, 176, 1850. 

 Menippe mercenaria Stimpson, Ann, Lye. Nat. Hist. N. Y,, vol. 7, p. 



53, 1859, — CouES, E,, and Yarrow, H, C, Proc, Acad. Nat. Sci. 



Phila., vol. 30, p. 120, 1871 ; Kingsley, idem. vol. 30, p. 318,— A. 



Milne Edwards, Miss, Sci. au Mexico, Tome V, p, 262, pi. 67 and 



pi. 68, fig. 3, 1880.— Hay and Shore, Bull. U. S. Bur. Fish., vol. 



30, p. 439, pi, 35, fig. 8, 1918. 



Genus : CARPILIUS Leach. 

 Carpilius corallinus (Herbst). 



Plate 43. 

 Diagnostic characters: Carapace wine-red maculated with vena- 

 tions of light yellow in all directions ; oval, evenly convex in all direc- 



