62 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Scyramathia hystrix (Stimpson). 
Amathia hystrix Stimpson, Bull. Mus. Comp. Zool., ir, 124, 1871. A. Milne Edwards, Crust. Reg. Mex., '134, 1878; 200, 
pi. xxviii, f. 1, 1879. 
Anamathia hystrix Smith, Proe. U. S. Nat. Mus., vn, 1884, 493 (1885). 
Carapace convex, covered with a tuberculiform pubescence and armed with sixteen long, slender, 
and sharp spines — two rostral; four median, of which two are gastric, one cardiac, and one intestinal; 
one gastric spine on either side of the median line; one hepatic on the margin; and three branchial, 
of which one is on the margin. Preorbital spine slender and much shorter than other dorsal 
spines; postorbital lobe slightly developed. Basal antennal joint with a spine at antero-external angle, 
a longer spine at the antero-external angle of buccal cavity. Chelipeds slender and weak, shorter and 
very little stouter than ambulatory legs; merus cylindrical, with a terminal spine; carpus with an 
outer spine; nianus slightly compressed and widening distally. Fingers toothed throughout their 
length, very little gaping. First ambulatory leg much the longest; all very slender; the meral joints 
terminate in a spine. 
Dimensions of male: Length, including rostrum, 31.2 mm.; excluding rostrum, 18 mm. ; breadth 
including lateral spines, 24.1mm.; excluding spines, 12.1mm. (Stimpson.) 
Florida Straits; West Indies. Depth, 82 to 387 fathoms. Mayaguez Harbor, Porto Rico, 220 to 
225 fathoms, station 6070; 1 female. 
Genus PELIA Bell. 
Pelia Bell, Proe. Zool. Soe. London, hi, 170, 1835. 
Carapace pyriform, swollen, without tubercles and covered witty a thin coating of soft hair. 
Rostrum well developed, composed of two rostral horns, united at base, divergent at their extremity. 
Upper orbital border smooth, without a spine. Basal article of antennse long, slender, and forming 
only an incomplete floor of orbit; it is advanced beyond orbital border and appears on borders of 
rostrum; flagellum well developed. The eye folds back into a fossette hollowed from the base of a 
tubercle limiting anterior boundary of hepatic region. Merus of outer maxillipeds notched at front 
inner angle for insertion of palpus. Chelipeds rather long, but feeble; fingers sharp-pointed, finely 
denticulate and in contact in their terminal half; movable finger with a large tooth near its base, which 
fits into an excavation in the pollex; the arm has a superior crest. First pair of ambulatory feet much 
longer than the others; last pair very small; meral joints much compressed, and having a prominent 
crest above; dactyli unarmed. Abdomen of male narrow, with seven segments. 
Pelia mutica (Gibbes). 
Pisa mutica Gibbes, Proe. Amer. Assoc. Adv. Sci.,in, 171, 1850. 
Pelia mutica Stimpson, Ann. Lye. Nat. Hist. N. Y., vii, 177, 1860; A. Milne Edwards, Crust. Reg. Mex., 73, pi. xvi, f. 2, 1875. 
Regions elevated, especially gastric and cardiac, which is surmounted by a rounded prominence. 
Lateral border entire. Rostrum almost two-fifths as long as rest of carapace; a furrow on its basal 
portion; horns more or less divergent. Basal antennal joint with or without a small spine at its outer 
extremity. Chelipeds in male about as long as body. 
Dimensions of male: Length, 9.5 mm.; width, 5.8 mm. 
Vineyard Sound to the west coast of Florida; Florida Straits. Porto Rico: Mayaguez; Boqueron 
Bay; off Boca Prieta, 8J fathoms, station 6075; off St. Thomas, 20 to 23 fathoms, station 6079. Porto 
Rico is beyond the recorded limit of this species, which is, however, doubtfully distinct from P. rotunda 
A. Milne Edwards, of the South American coast, from Brazil to Patagonia. 
Genus HEMUS A. Milne Edwards. 
Hcmus A. Milne Edwards, Crust. R<5g. Mex., 88, 1875. 
Carapace thick and swollen; longer than wide. Rostrum small; no preorbital spines; orbit 
incomplete below. Second and third articles of the external antennse remarkably wide and flat; the 
multiarticulate flagellum inserted at the external angle of the third article. Merus of outer maxillipeds 
long and little dilated outwards; exognath very wide in its basal and middle portion, narrowing toward 
its extremity. Chelipeds small; fingers slightly gaping, strongly bent inward toward their extremity, 
but scarcely spoon-shaped. Ambulatory legs short, but very strong; merus ornamented with cristiform 
prolongations; dactyli strong, much curved, without denticulations below. 
