THE BRA CH YURA AND MACRTTRA OF PORTO RICO. 
39 
the small red beads or tubercles scattered on anterior half of carapace, upper and outer surfaces of 
chelipeds, and upper surface of legs. Frontal lobes subtriangular, granulate on margin, more advanced 
near median line; interspace V-shaped. Antero-lateral projections four, short, stout and blunt or sub- 
acute. Upper orbital margin with a few red tubercles; lower margin finely denticulate, a small outer 
notch. Entire outer surface of both hands tuberculate, the tubercles growing smaller toward lower 
margin. Both fingers deeply grooved; tubercles on upper portion of basal half of dactylus; a few on 
outer surface of pollex. Outer lower margin of arm with a broad band of tubercles and granules. 
Length of male, 7.8 mm.; width, 10.4 mm. 
Tortugas; St. Thomas; Curasao. Taken by the Fish Hawk at Ensenada Honda, Culebra, and off 
St. Thomas, 20 to 23 fathoms, station 6079. 
Pilumnus pannosus Rathbun. 
Pilumnus gemmatus A. Milne Edwards, Crust. R6g. Mex., 290, pi. Li, f. 4, 1880. (Not P. gemmatus Stimpson, 1860.) 
Pilumnus pannosus Rathbun, Proc. TJ. S. Nat. Mus., xix, 142, 1896. 
Resembles P. gemmatus Stimpson. Carapace wider and less quadrate than in P. gemmatus. entirely 
covered with a soft, thick pubescence, which is not evenly distributed; here and there are longer, 
irregular, club-shaped setae, which give the crab a very ragged appearance. Anterior half of carapace 
and upper surface of chelipeds and legs dotted with bead-like tubercles, larger than in P. gemmatus. 
Frontal lobes subtriangular, granulate on the margin, more advanced near median line; interspace 
V-shaped. The antero-lateral projections look like shallow lobes until pubescence is removed, when 
they are seen to be triangular, well-separated spines with slender tips pointing forward. Upper margin 
of orbit with two tuberculiform spines near inner angle and two between those and outer angle; lower 
margin with a row of short, stout, blunt spines or tubercles of unequal size, and a V-shaped notch 
next the outer angle. 
The upper portion of hands tuberculate, but greater part of outer surface smooth and naked; 
smaller hand almost entirely covered with tubercles and granules; its lower distal portion bare. The 
pollex is smooth, and there are but a few tubercles on the dactylus near its articulation. Fingers 
with shallow grooves, which in the larger cheliped consist of shallow punctse. Outer lower margin 
of the arm smooth for its proximal half. Ambulatory legs pubescent and bordered with fringes of club- 
shaped setee mixed with long fine hairs. 
Length of male, 8.6 mm.; width, 12 mm. 
Bahama Banks; Gulf of Mexico; Florida Keys; Jamaica; St. Thomas. Reefs at Ponce, Porto Rico. 
Pilumnus holosericus Rathbun. 
Pilumnus holosericus Rathbun, Bull. Lab. Nat. Hist. State Univ. Iowa, iv, 268, pi. v, f. 1, 1898. 
Allied to P. gemmatus and P. pannosus. Carapace more oval than in those species. Surface 
covered with a short, smooth velvety pubescence which does not conceal boundaries of areolations. 
On either side of gastric region is a tuft of long hairs. Antero-lateral teeth shorter than in P. gemmatus 
and P. pannosus and blunt, even when pubescence is removed. Tubercles of carapace and chelipeds 
smaller and more numerous than in allied species. Larger hand with lower and distal portion of outer 
surface bare and unarmed, but this space is smaller than in P. pannosus. Fingers shorter than in that 
species. Smaller hand with entire outer surface pubescent and hairy. Ambulatory legs pubescent 
and fringed with long hairs. 
Length of male, 6.1 mm.; width, 8.3 mm. 
Bahamas; St. Thomas; St. John. Porto Rico: Mayaguez, on coral reef; Puerto Real; Boqueron 
Bay, on coral reef; reefs at Ponce; Arroyo. 
Pilumnus nudimanus, sp. nov. 
Carapace covered with a short, dense pubescence (easily rubbed off) among which area few tufts 
of longer stout sete on the frontal, gastric, and anterior branchial regions. On hepatic region is an 
oblique row, parallel to antero-lateral margin, of five or six small, reddish-brown bead-like tubercles, 
visible amid pubescence. Antero-lateral margin armed with three spines, stout at their base, but sharp 
at ends, which are hooked forward. Upper orbital margin has two or three bead-like tubercles similar 
to those of hepatic row; lower margin finely granulate or crenulate. Median sinus of front V-shaped, 
margins of lobes outside the sinus obliquely convex and finely granulate; the outer frontal tooth is 
