40 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
small, with a reddish tubercle at tip. Upper margin of arm has a strong distal, subterminal tooth. The 
wrist is densely pubescent except in a narrow groove parallel to distal margin, and bears alsoanumber 
of large tubercles of which there are in large cheliped about twenty-six behind groove and eleven 
in front of it. Hands very unequal in female, and naked, 
but sparingly dotted on the outer surface with tubercles, 
except on lower third of larger hand, which is smooth. 
Pollex short and thick; dactyli with tubercles above near 
their base. Legs long-hairy, upper surface of carpal and 
propodal segments flattened and paved with depressed 
pear-shaped tubercles. 
Dimensions of ovigerous female: Length, 6 mm.; 
width, 8.8 mm. 
Type locality, Arroyo; one female (Cat. No. 23770). 
A young specimen also was taken at Arroyo on the Light- 
house Reef. 
This species in the arrangement of tubercles on the 
carapace, in the bare and tuberculated palms, and in t he peculiar vertically flattened ambulatory legs, 
differs from all others found in America. 
Fig. 7 , — Pilumnus nudimanus, female, (a) Cara- 
pace, x 4. ( b ) Large chela, x 5.33. 
Pilumnus floridanus Stimpson. 
Pilumnus floridanus Stimpson, Bull. Mus. Comp. Zool., ii. 141, 1871. 
Pilumnus lacleus A. Milne Edwards, Crust. R6g. Mex., 292, pi. Lr. f. 5. 1880. (Not P. lacteus Stimpson, 1871.) 
Carapace covered with a short pubescence and a few longer fine hairs, a transverse series of 
which, across the frontal region, forms a somewhat conspicuous feature; there are also a few long 
clavate setae. Below the ciliated line the front is naked and its margin unarmed; its lobes are most 
strongly projecting near median sinus. Margin of orbit unarmed above, but armed below with eight or 
ten spiniform teeth. Antero-lateral margin with four spines, including orbital. A subhepatic spinule. 
No spines on hepatic region above. Whole outer surface of wrists and of smaller hand spinous; spines 
arranged in longitudinal rows on hands, on larger palm becoming obsolete near the lower and digital 
margins. Legs spinous. 
Length of male, 7 mm.; width, 9.6 mm. 
Distributed from the Gulf of Mexico to St. Thomas; Bahama Banks; to a depth of 30 fathoms. 
Porto Rico: Mayaguez Harbor, 25 to 30 fathoms, station 6062; off St. Thomas, 20 to 23 fathoms, station 
6079; off Vieques, 16 fathoms, station 6092. 
Pilumnus dasypodus Kingsley. 
Pilumnus dasypodus Kingsley, Proc. Boston Soc. Nat, Hist., xx, 155, 1879. 
Pilumnus vinaceus A. Milne Edwards, Crust. R5g. Mex., 283, pi. L, f. 2, 1880. 
Carapace on its anterior two-thirds covered with long, fine hair with occasional stouter setfe 
interspersed; upper part of chelipeds and surface of legs similarly clothed. Anterior half of carapace 
roughly granulate. Antero-lateral margin armed with four long, sharp spines curved slightly forward. 
Frontal lobes more advanced toward the middle than toward outside and armed with short spines. 
Orbital border spinous. Chelipeds very unequal, spinous and granulate, except lower and distal two- 
thirds of hand, which is smooth and naked. The movable fingers have only a bunch of spinules and 
hairs at base. Legs spinous above. 
Brownish wine color; feet brighter. Fingers and extremity of spines brown (A. Milne Edwards). 
Dimensions of male: Length, 6.5 mm.; width, 9.1 mm. 
Gulf of Mexico to Rio de Janeiro. Porto Rico: Mayaguez; Boqueron Bay; Puerto Real; reefs at 
Ponce; Ensenada Honda, Culebra. 
Pilumnus brasiliensis Miers. 
Pilumnus brasiliensis Miers, Challenger Rept., Zoo]., xvii, 151, pi. xm, f. 2, 1886. 
Carapace rather narrow, smooth, covered with short hair, and on anterior two-thirds rather thinly 
clothed with long, fine hairs; chelipeds and legs similarly clothed. Antero-lateral margin armed with 
four sharp spines; between the first and second a smaller spinule. Frontal lobes strongly deflexed, 
