THE BRACHYURA AND MACRURA OF PORTO RICO. 
61 
enlarged and compressed; lingers finely dentate, gaping to I he extremity in male, almost entirely 
closed in female. Ambulatory legs with tufts of setae on extremities of joints; meri and carpi with 
a few setiferous tubercles on anterior or upper margin. Abdomen with fourth and fifth segments 
coalesced in both sexes. 
Length of male, 18 mm.; width, 12.5 mm. 
Bahamas; West Indies; Brazil; Cape St. Lucas to Chile. Arroyo, Porto Rico; Aguadilla 
(( iundlach) . 
Genus CHORINUS (Leach MS.) Latreille. 
Chorinus (Leach ms.) Latreille, Encyc. Meth., Hist. Nut. Insect.es, x, 139 and 099, 1S25. 
Carapace oblong-oval. Rostrum with two slightly divergent horns. Preorbital spine stout, 
postorbital small, dentiform, remote from the orbit. Two superior orbital spines. Basal antennal 
segment short and narrow; flagellum short, concealed beneath the rostrum. Outer maxillipeds with 
the ischium advanced at the antero-internal angle; merus rhomhoidal, outer angle much produced, 
antero-internal margin oblique, ending posteriorly in a slight tooth. Abdomen (of male at least) 
with seven segments. Chelipeds elongate. Ambulatory legs of first pair long, remaining pairs 
very short. 
Chorinus heros (Herbst). 
Cancer herns Herbst, Natur. Krabben it. Krcbse, it, 16.9, pi. xlii, f. 1, 1796. 
Chorinus hems (Leach .ms.) Latreille, Encyc. Meth., Hist. Nat., Insectes, x, 139, 1825: Milne Edwards in Cuvier’s R. Anim., 
Disciples ed., Crust., 85, pi. xxix, 1. 2. 
Carapace pubescent, convex, posterior two-thirds smooth, anterior third deflexed, covered with 
short, blunt tubercles or spines, from which proceed a tuft of coarse hairs; these tubercles are continued 
part way on the rostrum. Rostral horns stout, more or less incurved, about one-third the length of 
remainder of carapace, furnished with long hairs, which are very abundant on inner margin. Pre- 
orbital spines about one-third the length of rostral horns, curved and directed forward. Marginal 
spines two, one gastric and one hepatic, the former the longer, flattened, both curved. Above the 
orbit are two tubercles or stout spines, the anterior the larger and more or less compound. The 
branchial region has a few tubercles at anterior angle and on its antero-lateral margin. Subhepatic 
and pterygostomian regions tuberculate. Basal antennal joint with a stout spine at its extremity and 
a tubercle on lateral margin, and in the same line there is a tubercle near angle of buccal cavity; first 
two joints of flagellum flattened, the first joint widening at its distal extremity. Chelipeds naked and 
smooth, attaining a length of 1.5 times the length of the carapace in the male; merus cylindrical ; 
man us compressed and slightly dilated, the palmar portion about twice the length of fingers. Fingers 
gaping slightly for their distal third. Ambulatory legs stout, pubescent and hairy, the first, pair 
attaining a length greater than that of carapace; second, third, and fourth pairs much shorter and 
decreasing regularly in length. 
Length of male, according to the figure given I >y Milne Edwards, 64 mm. ; width, 36.2 mm. ; length 
of horns, 14.2 mm. 
Florida Keys; West Indies; Rio Vermelho, Bahia, Brazil; Bermudas. Porto Rico: San Antonio 
Bridge, San Juan; Caballo Blanco Reef, Vieques; off Vieques, 14 to 16 fathoms, stations 6085 and 6092; 
off Humacao, 94 fathoms, station 6099. Specimens mostly very young. Aguadilla (Gundlach). 
Genus SCYRAMATHIA A. Milne Edwards. 
Amatlda Roux, Crust. MOdit., pi. nr, 1828, with accompanying description. (Name preoccupied. ) 
Scyramathia A. Milne Edwards, Comptes Rendus de l’Acad. Sci. Paris, xci, 356, 1880. 
Anamathia Smith, Proc. U. S. Nat. Mus., vn, 1884, 493 (1885). 
Carapace subtriangulate, with posterior margin rounded; armed with spines or spines and tubercles. 
Preorbital spine usually present; postorbital lobe present. Basal antennal joint slender and either 
unarmed or with one or more spines. Merus of outer maxillipeds truncated distally, and slightly 
produced at the antero-external angle. Chelipeds usually slender, often greatly elongated in the male. 
Ambulatory legs slender and elongated. 
