THE CANCROID CRABS OF AMERICA 49 



PORTUNUS (PORTUNUS) GIBBESn (Stimpson) 



Plates 16 and 17 



Lupa gibbesii Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, 1859, p. 57 



[11] (type-localities, South Carolina and St. Augustine, Florida; types not 



extant) . 

 Achelous gibbesii Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, 1860, p. 



222 [94]; as far north as Beaufort, N. C. 

 Neptunus gibbesii A. Milne Edwards, Arch. Mus., Hist. Nat., Paris, vol. 10, 



1861, p. 326, pi. 31, fig. 1-16. 

 Portunus gibbesii Rathbun, Amer. Nat., vol. 34, 1900, p. 140. 



Diagnosis. — Carapace broad and rough. A round bare spot on 

 the postlateral slope. Arms 5 or 6 spined, Merus of swimming 

 legs spinulous. 



Description. — Carapace very broad, moderately convex; surface 

 uneven, coarsely granulate, granules irregularly disposed. Two 

 transverse granulate gastric ridges and an oblique sinuous one, 

 extending from the tip of the lateral spine across the branchial 

 region; two short oblique branchial ridges; a broad transverse band 

 of granules on the cardiac region, interrupted at middle, and forming 

 a T with a median ridge behind it. Surface pubescent except on 

 the elevations and on an iridescent roimd spot on the postlateral 

 slope just above the insertion of the penult leg. Usually two small 

 bare spots along the antero-lateral margin, a small spot at base of 

 fourth tooth and a longer one at sixth and seventh teeth. Rostral 

 distance narrow, the teeth of the median pair smaller than those 

 of the outer pair and slightly more advanced. Inner orbital angle 

 bidentate, the inner tooth nearly as advanced as the outer tooth 

 of the front. Orbital fissures with V-shaped openings, the inner 

 angle of the outer fissure, produced in a small denticle. Inner 

 suborbital tooth very large, much more advanced than the superior 

 teeth. On the antero-lateral margin the first or orbital tooth is 

 broader and blunter than the others; the seven following teeth are 

 subequal, outer margins convex, tips spined; lateral spine between 

 3 and 4 times as long as the preceding tooth, nearly transverse, tip 

 curved forward. 



Chelipeds very long, pubsecent, granulate on the carinae; merus 

 armed wdth 5, sometimes 6, spines on the inner margin, and one 

 at end of outer margin; outer half of lower-outer surface hairy. A 

 spine at inner and at outer angle of carpus. Manus with 6 carinae, 

 the one on inner edge of lower surface very blunt; a line of granules 

 through middle of inner surface; a spine at articulation with, carpus, 

 another not far behind distal end of upper margin. Merus of 

 swimming-leg nearly as broad as long, its postero-distal margin 

 spinulous. 



79856—30 5 



