. Bulletin - United States National Museum. Science. THE SPIDER CRABS OF AMERICA 345 Genus HEMUS A. Milne Edwards Hemus A. Milne Edwards, Crust. Reg. Mex., 1895, p. 88; type, H. cristu- lipes A. Milne Edwards.—Rathbun, Bull. U. S. Fish Comm., vol. 20, for 1900, pt. 2, 1901, p. 62. « Carapace thick and swollen; longer than wide. Rostrum small; no preorbital spines; orbit incomplete below. First and second movable articles of the external antennae remarkably wide and flat; the miiltiarticu- late flagellum inserted at the external angle of the second. Merus of outer maxillipeds long and little di
. Bulletin - United States National Museum. Science. THE SPIDER CRABS OF AMERICA 345 Genus HEMUS A. Milne Edwards Hemus A. Milne Edwards, Crust. Reg. Mex., 1895, p. 88; type, H. cristu- lipes A. Milne Edwards.—Rathbun, Bull. U. S. Fish Comm., vol. 20, for 1900, pt. 2, 1901, p. 62. « Carapace thick and swollen; longer than wide. Rostrum small; no preorbital spines; orbit incomplete below. First and second movable articles of the external antennae remarkably wide and flat; the miiltiarticu- late flagellum inserted at the external angle of the second. Merus of outer maxillipeds long and little dilated outwards; exognath very wide in its basal and middle portion, narrowing toward its extremity. Chelipeds small; fingers slightly gaping, strongly bent inward toward their extremity", but scarcely spoon-shaped. Ambulatory legs short, but very strong; merus ornamented with cristi- form prolongations; dactyli strong, much curved, without denticulations below. The dilated legs fit together in such a way that with the antennal peduncle and the deflexed rostrum, they form a large cavity underneath the body. Contains only the two following allied species occurring on opposite shores of the continent: cristvlipes (Atlantic), analogus (Pacific).. Fig. 110.—Hemus cristulipes (19724), MAXILLIPED, X KEY TO THE SPECIES OF THE GENUS HEMUS A '. Tips of rostrum separated by a sinus wider than either tip. Cardiac promi- nence high cristulipes, p. 345. A ^. Tips of rostrum almost contiguous. Cardiac prominence larger, embracing part of the branchial regions and of the intestinal region, .analogus, p. 347. HEMUS CRISTULIPES A. MUne Edwards Plate 124, fig. 1; plate 248, figs. 9-15 Hemus cristulipes A. Milne Edwards, Crust. Reg. Mex., 1875, p. 88, pi. 16, figs. 1-1/ (type-locality, near Contoy, at the entrance of the Gulf of Mexico, 12 to 18 fathoms; holotype. Cat. No. 1943, M. C. Z.).—Auri- viLLius, K. Sv. Hand., vol. 23, pt. 1, 1889, p. 45, pi. 3, fig. 6.— Rathb
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