THE SPIDER CRABS OF AMERICA 



279 



figs. 2-26. — KiNGSLEY, Proc. Acad. Nat. Sci. Philadelphia, vol. 31, 1879, 

 p. 385.— Sumner, Bull. Bur. Fisheries, vol. 31 for 1911 (1913), pt. 1, p. 

 331 (chart 113); pt. 2, p. 670. 



Diagnosis. — Greatest width of carapace about two-thirds its greatest 

 length. Outer margins of rostral horns either diverging anteriorly or 

 parallel. 



Description. — Gastric and cardiac regions elevated, the latter 

 smoothly rounded. Rostrum nearly two-fifths as long as remainder 

 of carapace, a furrow on its basal portion; horns more or less diver- 

 gent, their outer margins often parallel. Basal antennal article half 

 visible in dorsal view, and usually furnished with a small tooth or 

 spine at antero-external angle. 



Chelipeds of well-developed male as long as first ambulatory leg 

 but stouter and almost bare. Upper and inner margins of merus 

 dentate; a longitudinal denticulate ridge on the 

 carpus; upper and lower margins of manus 

 slightly arcuate; basal half of fingers widely 

 gaping, the sinus of the dactylus being longer 

 than that of the fixed finger; the occludent 

 margins, as well as the broad basal tooth of 

 the dactylus, are denticulate. 



Color. — Bright red in patches on carapace, 

 and in bands on legs, spots of lighter red on 

 chelipeds. 



Measurements. — Male (40750) , length of cara- 

 pace on median line 11.2, to end of horns 13.4, 

 width of carapace 8.8 mm. 



Habitat. — -On gravelly and shelly bottoms of 

 bays and sounds. 



Range. — Buzzards Bay and Vineyard Sound, 

 Massachusetts, to west coast of Florida; Cuba, Porto Rico, and St. 

 Thomas, West Indies. Low water to 273^ fathoms. 



Material examined. — -See table, pages 276-277. 



PELIA ROTUNDA A. Milne Edwards 



Plate 100 



Pelia rotunda A. Milne Edwards, Crust. R^g. Mex., 1875, p. 74 (type- 

 localities, Desterro, Brazil, figured type in Paris Mus., and northern 

 Patagonia, cotypes. Cat. No. 1899, M. C. Z.). — Rathbun, Proc. U. S. 

 Nat. Mus., vol. 16, 1893, p. 89. 



Pelia rotundata A. Milne Edwards, Crust. R4g. Mex., 1875, pi. 16, figs. 

 4-4^. 



Diagnosis.— DiSers little from the preceding. Gastric and cardiac 

 regions more swollen, rostrum more deflexed, width of carapace at 

 hepatic regions relatively greater; spine at external angle of basal 

 antennal article a little longer. Perhaps not specifically distinct from 

 P. mutica. 



Fig. 94.— Pelia mutica (40750), 

 maxilliped, x 17 



