ayaa PROCEEDINGS OF THE NATIONAL MUSEUM. 235 
A” Carapace without dorsal sulci. 
B’ Manus with spines. * 
C’ Carapace with much flattened, setigerous granules........----.-.-- aculeatus. 
CLC arapace punciaberana: SpMNys so -2 eee a2 oly + ace ies ese spinosissimus. 
Ca Carapace denselyphalinvgy coterie ean = seis aevs ene we eae sessile pilosus. 
B” Manus without spines. 
C’ Rostrum tuberculiform. 
D’/ Ambulatory legs with a thin lamellate crest -.....----- Mithrax, sp., Miers. 
D” Ambulatory legs without a thin lamellate crest. 
E’ Carpus with inner margin armed with two or three blunt spines. verrucosus. 
EK” Carpus with surface tuberculous. 
F’ Basal antennal joint with aspine at its antero-lateral angle. -.- sinensis. 
F” Basal antennal joint with a lobe atits antero-lateral angle -. -cristulipes. 
F’” Basal antennal joint with a truncate tooth at its antero-lat- 
eral angle, oon ese chi Dae Sie aia Sees shige ie a Sarat braziliensis. 
oS 
BA Carus cwit hi stintaGe yun evens... 1 cree. sels ease eto aoe eee hispidus. 
C’’ Rostrum short and sharp. 
D’ Carapace strongly tuberculous. Lateral margins heavily armed.-hemphilli. 
D” Carapace pubescent. Lateral margins almost unarmed.. .----- bahamensis. 
C’” Rostrum long and sharp. 
D’ Carapace strongly tuber culousaes. soy eer oS soe cect So a acuticornis. 
Die Carapacecwrthyscattered: tubercles: a. - oe sere Se = se ne spinipes. 
Subfamily PERICERINA. 
Libinia Leach (amended. ) 
Leach, Zod]. Misc., 11, p. 129, 1815. Say, Jour. Acad. Nat. Sci. Phila., 1, p. 76, 1817. 
Latreille, Kegne Anim., 11, p. 21, 1817 (2nd. ed., Iv, p. 61); translation, M1, p. 
46, 1831. (Desmarest, Consid. sur les Crust., p. 161, 1825.) Milne Edwards, 
Hist. Nat. des Crust., 1, p. 298, 1834. De Haan, Fauna Japonica, Crust., p. 86. 
De Kay, Crust. of N. Y., p. 1,1844. Dana, Crust. U. S. Ex. Ex., 1, p. 80, 1852. 
A. Milne Edwards, Miss. Sci. au Mexique, pt. 5, 1, p. 127, 1875. Miers, Jour. 
Linn. Soc. London, xiv, p. 662, 1879; Challenger Rept., Zo6dl., Xvu, p. 72, 1886. 
Carapace convex; tuberculous or spinous; triangular-orbiculate and 
evenly rounded behind the frontal region, or oblong-orbiculate and con- 
stricted behind the hepatic regions which are dilated laterally. Pree- 
ocular spine usually distinct. Rostrum emarginate or bifid at the apex. 
Orbits small, nearly circular, sometimes with an open fissure in the 
upper and lower margins. Basal antennal joint moderately enlarged. 
Merus of exterior maxillipeds truncated at the distal end. Chelipeds 
well developed; palm elongated; fingers evenly denticulated on inner 
margins. Ambulatory legs well developed, sometimes elongated; joints 
subeylindrical, usually unarmed. 
Libinia emarginata Leach. 
Plate xxx, fig. 2. 
Libinia emarginata Leach, op. cit., p. 130, pl. 108. (Desmarest, op. cit., p. 162.) 
White, Cat. Brit. Mus. Crust., p. 4, 1847. Smith, Trans. Conn. Acad., v, p. 45, 
1879; Verrill’s Check List of N. Amer. Invert., p. 1, 1879; Rept. U. 8. Commr. 
of Fisheries for 1885 (1887), p. 627. Kingsley, Proc. Acad. Nat. Sei. Phila., xxXI, 
p. 386, 1879. Miers, Jour. Linn. Soc. London, xiv, p. 662, 1879; Challenger 
* In young specimens and females, the spines are not always evident. 
