THE BRACHYURA AND MACRURA OF PORTO RICO. 
27 
Leptodius floridanus (Gibbes). 
C hlbrodius floridanus Gibbes, Proc. Amer. Assoc. Adv. Sci., Hi, 175, 1850. 
Leptodius floridanus A. Milne Edwards, Crust. R<5g. Mex., 268, pi. xlix, f. 2, 1880. 
Lobules of carapace flattened, crossed by small transverse lines a little granulous or punctate, and 
separated by shallow grooves. Frontal lobes truncate and with a transverse groove. First three 
anterolateral teeth obtuse or subacute, last two pointed. Merus of clielipeds short, not surpassing 
carapace; wrist and upper portion of hand rugose; the fingers touch only at their extremities; there is 
a tuft of hairs in the hollow. Legs hairy on margin. Color variable; sometimes a grayish green, 
sometimes yellow with red spots. Fingers black. (A. Milne Edwards.) 
Length of male, 20.2 mm.; width, 31 mm.; fronto-orbital width, 17 mm.; frontal width, 7.9 mm. 
Bahamas; Florida Reefs to Brazil; Bermudas. Porto Rico: Reefs at Guanica; Ponce; Playa de 
Ponce Reef; Arroyo; Caballo Blanco Reef, Vieques; Ensenada Honda, Culebra; San Juan (G. M. Gray). 
Genus XANTHODIUS Stimpson. 
Xanthodius Stimpson, Arm. Lyc. Nat. Hist. N. Y., Vii, 52, 1859. 
Carapace very broad, oval, very convex anteriorly, flat in posterior half; the regions deeply 
limited, and deeply lobulated in anterior two-thirds. Antero-lateral borders arched, longer than in 
Leptodius , thick, cut into four rounded lobes or thickened, blunt, little-projecting teeth, exclusive of 
orbital angle, which is inconspicuous; postero-latei’al borders nearly straight. Fronto-orbital border 
less than half the greatest width of carapace; front about a fourth the greatest width of carapace. 
Front more deflexed, but less prominent than in Leptodius; otherwise similar. Orbits very small; the 
two upper suture lines very faint; tooth at inner angle of lower edge not prominent. Eye-stalks short 
and thick. Inner orbital hiatus narrow, the antennal flagellum lodged in it. Merus of outer maxil- 
lipeds considerably broader than long. Chelipeds unequal in both sexes; surface eroded m reticulating 
lines; fingers spoon-shaped. Legs short, compressed. In the abdomen of male the third to fifth 
Segments are fused. 
Xanthodius parvulus (Fabricius). 
Cancer parvidus Fabricius, Ent. Sys. auet. et emend., n, 451, 1793. 
Chlorodius americanus Saussure, M6m. Soc. Phys. Hist. Nat. Geneve, xiv, 430, pi. i, f. 5, 1858. 
Leptodius americanus A. Millie Edwards, Crust. ROg. Mex., 269, 1880. 
Xanthodius parvidus Rathbun, Ann. Inst. Jamaica, i, 15, 1897. 
Lobules of carapace prominent and roughened with punctse. Outer orbital angle small and 
inconspicuous; there are, besides, four blunt teeth; posterior marginal line of last tooth continued half 
way back on postero-lateral margin. Front bimarginate, lobes of upper margin truncate, of lower 
concave. Arm of chelipeds scarcely exceeding carapace; wrist and hand rugose above and with some 
irregular depressions. Legs very finely granulate and slightly hairy. 
Length of male, 15 mm.; width, 24.5 mm.; fronto-orbital width, 11.4 mm.; frontal width, 6 mm. 
Bahamas; Florida Reefs; West Indies; Curasao; Fernando Noronha (Pocock) ; Bermudas 
(Verrill). Ponce, Porto Rico. 
Genus CYCLOXANTHOPS Rathbun. 
Cycloxantlius A. Milne Edwards, Ann. Sci. Nat. (4), xx, 278, 1863. 
Cycloxanthops Rathbun, Proc. Biol. Soc. Washington, xi, 164, 1897. 
Carapace broad; front horizontal, prominent, and divided by a median fissure into two lamellar 
lobes, and separated from the internal orbital angles by a deepish notch. Orbits small ; two fissures in 
the supra-orbital margin; external orbital angles inconspicuous, continuous with the antero-lateral 
borders. Antero-lateral borders very long, strongly curved, extending far backwards. Basal antennal 
joint short, but touching the front at its inner angle; flagellum inserted in orbital hiatus. Merus of 
the external maxillipeds subquadrilateral. Fingers sharp-pointed, not. hollowed. The abdomen of 
male consists of five movable pieces. 
Cycloxanthops denticulatus (White). 
Xantho denticulatus White, Ann. Mag. Nat. Hist. (2) , n, 285, 1848. A. Milne Edwards, Crust. Reg. Mex., 252, pi. xlv, f. 2, 1879. 
Cycloxanthops denticulatus Rathbun, Ann. Inst. Jamaica, I, 14, 1897. 
Width of carapace about 1.5 times length; regions well marked; surface punctate and pitted; the 
anterior portion lobulate, the lobules rugose. Antero-lateral borders having eight or ten small tuber- 
