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 f urcillatus, 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 regularly placed 

 tubercles. Preorbital spine as long as post- 

 orbital. Length of propodus of cheliped, measured on its upper mar- 

 gin, more than three times its greatest width. Three spines on lower 

 border of merus of third leg. 



Description. — Carapace pubescent; a small median spine above 

 posterior margin; four gastric and two branchial prominences; lateral 

 margin of branchial regions with a row of spinules, continued on 

 the pterygostomian region. Hepatic region with a minute spine. 

 Rostrum long, from two-thirds to one and a fourth times the post- 

 frontal length of the carapace; forked in the terminal half; horns 

 slightly divergent. Antennae shorter than rostrum. 



Fig. 6.— ANOMALOTHIR FURC1LH.TU3 

 (18127), MAXILLIPED, X 17 



