THE BRACHYURA AND MACRURA OF PORTO RIOO. 
35 
or four lobes or teeth besides the orbital. Orbital margin with the three grooves either fairly distinct 
or quite indistinct. Basal antennal joint broad and very short; the flagellum, which is rather longer 
than orbit, lodged in orbital hiatus. Anterior edge of merus of external maxillipeds almost transverse. 
Chelipeds either equal or unequal in both sexes; the arm in repose is nearly or quite hidden beneath 
carapace; lingers pointed, not hollowed at tip. Legs stoutish, more or less hairy and granular or 
spiny along the upper border. Abdomen of male five-jointed. 
Xanthias nuttingi Rathbun. 
Xanthias nulling i Rathbun, Bull. Lab. Nat. Hist. State Univ. Ioiva, iv, 271, pi. iv, f. 1, 1898. 
Carapace suboval, convex in an antero-posterior direction, nearly flat in a transverse direction; 
anterior half rough with scaly granules; regions distinct. Front convex and having two lobes with 
granulate margins, separated by a V-shaped sinus. Antero-lateral margin with three sharp-pointed 
teeth besides the orbital, which is obliquely truncate and not prominent ; posterior tooth smallest. 
Margin of orbits and of lateral teeth granulate. Second normal tooth of this genus (or that next the 
orbital) obsolete in this species. Outer fissure of orbit broad and V-shaped. Chelipeds heavy, unequal, 
arm spinulous on upper edge; wrist covered with bead-like tubercles, with a deep anterior groove and 
a small inner tooth terminating in a spinule. Larger hand in male with upper and about two-thirds 
of outer surface ornamented with bead tubercles; lower third and distal extremity smooth and shining; 
fingers broad, not gaping, brown with light tips; dactylus with a large basal tooth; color of pollex not 
running back on the manus, but forming a line with articulation of dactylus. Smaller hand almost 
entirely covered with tubercles, which grow smaller toward distal and lower margin; upper margin 
with a longitudinal groove; fingers deeply grooved. Upper margins of ambulatory legs tuberculate or 
granulate. The females differ in having the whole outer surface of the larger as well as the smaller 
tuberculate. 
Color in alcohol, speckled with blue; larger patches of blue on anterior gastric and cardiac region. 
Male: Length, 4 mm.; width, 5.5 mm.; fronto-orbital width, 4 mm.; frontal width, 2 mm. 
Bahama Banks; Gulf of Mexico and Caribbean Sea, 21 to 25 fathoms; Jamaica; offCajieSt. Roque, 
Brazil, 20 fathoms. Porto Rico: Mayaguez Harbor, 25 to 30 fathoms, station 6062, and 4 to 6 fathoms, 
station 6065; off Boca Prieta, 8£ fathoms, station 6075; Playa de Ponce Reef; off St. Thomas, 20 fathoms, 
station 6080; off Vieques, 14 fathoms, station 6085; off Huma^ao, 9| to 12£ fathoms, stations 6098 
and 6099. 
Genus ETJCRATODES A. Milne Edwards. 
Eucratodes A. Milne Edwards, Crust. R6g. Mex., 346, 1880. 
Carapace oval, of moderate width, antero-lateral margins arcuate, feebly dentate, postero-lateral 
slightly converging. Fronto-orbital width about two-thirds the greatest width of carapace. Frontal 
lobes entire. No upper or outer fissures on orbital margin. Basal article of antennte short, just touching 
a prolongation of front; the flagellum lies in the orbital hiatus. Antennules folded transversely. Buccal 
cavity broad; margin of epistome with two notches on each side; endostome without ridge. Merus 
of outer maxillipeds subquadrilateral, notched at inner angle for articulation of palpus. Chelipeds of 
moderate size and nearly equal; fingers pointed. Ambulatory legs slender, smooth; dactvli elongate. 
Third, fourth, and fifth segments of abdomen fused; third segment angular at sides, reaching coxae of 
fifth pair of feet. 
Eucratodes agassizii A. Milne Edwards. 
Eucratodes agassizii A. Milne Edwards, Crust. R6g. Mex., 347, pi. lxi, f. 1, 1880; Bull. Mus. Comp. Zool., vm, 14, 1880. 
Carapace thick, very convex in an antero-posterior direction, slightly convex transversely ; regions 
scarcely indicated; surface smooth to naked eye, but under the lens it is punctate and obscurely 
granulate, except along antero-lateral margin, where the granules are plainly seen. Antero-lateral 
margin obscurely five-toothed, first or orbital tooth small; second rounded and separated from the 
first by a shallow sinus, as in species of Eurypanopeus; third larger, but little prominent; fourth most 
prominent; fifth small. Front slightly bilobed; a short closed median fissure; margin thin. Lower 
surface of carapace coarsely granulate. The arm has a superior subterminal tooth, the wrist a blunt 
inner tooth. Surface of chelipeds similar to that of carapace; lower surface of palms coarsely granulate. 
Dactylus of large hand with a large basal tooth. The brown color of the thumb covers only its distal 
half. The chela figured by Milne Edwards is the smaller of the two; the larger is more swollen. 
