. Bulletin - United States National Museum. Science. THE CANCROID C RABS OF AMERICA 385 lower angle of orbit conical, produced much beyond upper angle; outer hiatus deep, closed at bottom, wide spreading at opening. No subhepatic tubercle. One and sometimes two small teeth on upper margin of arm; carpal groove deep, tooth at inner angle subcylindrical, stout, obtuse, a shallow lobe below it; major palm smooth, deep, swollen, fingers widely gaping, a cylindrical tooth near the base of the strongly arched dactyl; fingers hooked at tips; the color of immovable finger ends in the old, in an obliqu
. Bulletin - United States National Museum. Science. THE CANCROID C RABS OF AMERICA 385 lower angle of orbit conical, produced much beyond upper angle; outer hiatus deep, closed at bottom, wide spreading at opening. No subhepatic tubercle. One and sometimes two small teeth on upper margin of arm; carpal groove deep, tooth at inner angle subcylindrical, stout, obtuse, a shallow lobe below it; major palm smooth, deep, swollen, fingers widely gaping, a cylindrical tooth near the base of the strongly arched dactyl; fingers hooked at tips; the color of immovable finger ends in the old, in an oblique line not extending further on palm; in smaller specimens the color line is vertical and does not quite reach base of finger. Legs slender; dactyls long and hairy. Third, fourth, and fifth segments of male abdomen partially anchy- losed; third segment not as wide as first, its outer ends rounded; terminal segment rounded at tip. Color.—Variable, sometimes a uniform brownish yellow or even light buff, but usually a dark red- dish brown or dark gray, the females usually darker than the males and often more or less spotted. In both sexes the fingers are black or dark brown at the base, lighter at the tips. (Hay and Shore.) M.«m« holotype, length of cara- ^Z^S^^X^J^iTSZ pace , width of same , fronto-orbital men, enlarged, after width 13, width of front mm. Most of the ^^^^^'"" ^^° ^^^^^'^ specimens from Chesapeake Bay and from South Carolina southward are small. Variation.—A single male (21236) from Jamaica is atypical. It has the not uncommon abnormalitJy of two minor chelipeds instead of a major and a minor; but these are not only similar in form but of nearly equal size and are much longer and stronger than its small carapace ( mm. wide) would normally carry, the merus projecting well beyond the carapace. In addition, the sinus of the coalesced lateral tooth of the carapace is deeper and wider than usual and the ambulatory legs are ve
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