THE BRACHYURA AND MACRURA OF PORTO RICO. 
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Hemus cristulipes A. Milne Edwards. 
Hemus cristulipes A. Milne Edwards, Crust. Reg. Mex., 88, pi. xvi, f. 1, 1875. 
Body and feet almost completely smooth. The rostrum is wide, short, bicarinated above, bent 
downward, and bifurcated at its extremity. Upper orbital border unarmed, but having a narrow 
fissure; the post-orbital cavity into which the eye can be retracted is incomplete. Basal article of outer 
antennse wide, short, and not spinulous; a notch separates it from lower border of carapace. The 
carapace sparsely granulous; very swollen, especially in cardiac region, which is markedly prominent. 
Postorbital portion wide; gastric region high; branchial regions elliptical, bearing on each side two 
subacute prominences directed outward; the first stronger than second. Chelipeds of male very 
small and smooth. First pair of ambulatory legs longer and stronger than the others; fifth very small. 
Merus of all the legs very wide, having above a crest and below a lamellar prolongation with a crenu- 
late and arcuate border; other joints of feet small. Abdomen of both sexes with seven free segments, 
the last elongate in the male. 
Dimensions of female: Length, 7 nun.; width, 5.7 mm. 
Gulf of Mexico; Central America. Depth, 8£ to 27 fathoms. Porto Rico: Off Boca Prieta, 8J 
fathoms, station 6075; off Vieques, 15 fathoms, statior 6091 off Culebra, 15 fathoms, station 6093. 
Genus THOE Bell 
Thoe Bell, Proe. Zool. Soc. London, in, 170, 1835. 
Plaiypes Lockington, Proc. Cal. Acad. Sci., vn, Mar. 20, 1876, p. 11 (1), 1877. 
Carapace of moderate width, thick, lobulate; fronto-orbital region wide; rostrum small; no pre- 
orbital spine; orbital border unarmed. Basal article of antenna large; second article rather flat and 
attached to first joint near rostrum, but at a great distance from orbit. Exognath of outer maxillipeds 
very wide in middle. Sternal plastron almost circular. Chelipeds long and usually strong; hand com- 
pressed; fingers spoon-shaped, gaping in the adult. Ambulatory feet wide, decreasing rapidly in length 
from the first to the fourth; meral joints with longitudinal crests; last two joints short and nodose. 
Key to the Porto Rican species of the genus Thoe. 
A. Carapace and basal antennal joint- without spines puclla 
A'. Carapace with postero-latcral spines; basal antennal joint with two distal spines aspera 
Thoe puella Stimpson. 
Thoe puclla Stimpson, Ann. Lyc. Nat. Hist. N. Y., vn, 178, 1860; A. Milne Edwards, Crust. Reg. Mex., 122, pi. xix, f. 3, 1873. 
Antero-lateral margins straight or nearly so; lobulations of dorsal surface well marked, covered 
with bunches of granules crowded together. Rostral horns separated by a deep, narrow fissure. 
Antenna; fringed with long hair; basal joint as wide as long, with antero-external angle a blunt tooth. 
Arm and wrist of chelipeds covered with fine granulations, the arm with a line of tubercles on upper 
margin; hand smooth and shining except near articulation, where it is granulate, superior margin 
sharp for its proximal half; fingers finely serrulate within; a tooth near base of dactyl in male; fingers 
rather widely gaping in adult male; narrowly gaping in adult female. The posterior laminate crests 
on meral joints of ambulatory legs longer than anterior and about twice as wide; their upper surfaces 
concave, margins undulate and finely crenulate; carpal joints have a bilobed anterior crest and a tooth 
on posterior margin; propodal joints with a narrow crest on each side and a blunt spihe above. 
Color, reddish, or a brilliant red, with yellow spots (A. Milne Edwards). 
Dimensions of male: Length, 10.4 mm.; width, 9 mm. 
Florida Keys; West Indies. Reefs at Ponce, Porto Rico. 
Thoe aspera, sp. nov. 
Carapace more elongate than in T. puella , the gastro-cardiac suture is farther back, or halfway 
between posterior margin of carapace and posterior margin of orbit. Lobules separated by shallower 
depressions than in T. puella; protogastric and mesogastric lobules surmounted by high, acute tubercle; 
cardiac lobule with a similar but lower tubercle. Postero-lateral angle with a short spine; above and 
anterior to the spine, a sharp tubercle; another on each side of the middle near posterior margin; and 
in front of these last still another on branchial region. Rostral horns curving slightly inward and 
separated by a large V-shaped sinus. Basal antennal joint narrower than in other species of genus, 
considerably longer than broad and armed distally with two spines, outer one above inner, both 
visible in a dorsal view; outer margin concave, a longitudinal crest at outer third; both crest and 
