. Bulletin - United States National Museum. Science. 24 BULLETIN 129, UNITED STATES NATIONAL MUSEUM Carapace much elongated, almost subcylindrical. Rostrum very- long, bifurcate; horns contiguous for half their length or more. Eyes without orbits; preorbital spine small, acute; postorbital minute. Antennae exposed in dorsal view, basal article narrow. Antennular fossae large. Epistome more than half as long as broad. Merus of maxillipeds without a notch at the inner angle where the palpus is inserted; outer angle sharply prominent. Chelipeds in adults longer than the carapace; merus subcylindr
. Bulletin - United States National Museum. Science. 24 BULLETIN 129, UNITED STATES NATIONAL MUSEUM Carapace much elongated, almost subcylindrical. Rostrum very- long, bifurcate; horns contiguous for half their length or more. Eyes without orbits; preorbital spine small, acute; postorbital minute. Antennae exposed in dorsal view, basal article narrow. Antennular fossae large. Epistome more than half as long as broad. Merus of maxillipeds without a notch at the inner angle where the palpus is inserted; outer angle sharply prominent. Chelipeds in adults longer than the carapace; merus subcylindrical; propodus elongate, slightly compressed; fingers of male less gaping than of female. Ambulatory legs of fii-st two pairs long and slender, the first pair much the longer; third and fourth pairs shorter, stouter and prehensile, the third pair the shorter. Abdomen of seven segments in both sexes. Contains only two species. KEY TO THE SPECIES OF THE GENUS ANOMALOTHIR A^ Three spines on lower border of merus of third leg. Length of palm more than three times its greatest width. Carapace with regularly placed tubercles furcillatus, p. 24. A^. No spines on lower border of merus of third leg. Length of palm not more than three times its greatest width. Carapace almost smooth frontalis, p. 25. ANOMALOTHIR FURCELLATUS (Stimpson) Plate 8, fig. 2; plate 9, fig. 2; plate 206 Anomalopus furcillatus Stimpson, Bull. Mus. Comp. Zool., vol. 2, 1871, p. 125 (type-locality, off "The Samboes," 123 fathoms; type not extant).—A. Milne Edwards, Crust. Reg. Mex., 1879, p. 188, pi. 35, figs. 4-4e; Bull. Mus. Comp. Zool., vol. 8, 1880, p. 8. Anomalothir furcillatus Miers, Journ. Linn. Soc. London, vol. 14, 1879, p. 648.— Rathbun, Proc. U. S. Nat. Mus., vol. 17, 1894, p. 65; Bull. Lab. Nat. Hist. State Univ. Iowa, vol. 4, 1898, p. 254.—A. Milne Edwards and BouviER, Mem. Mus. Comp. Zool., vol. 47, 1923, p. 368, pi. 10, figs. 6 and 7; pi. 12, fig. 1. Diagnosis.—Carapace with regularl
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