Ws 
246 CRABS OF THE FAMILY PERICERID—RATHBUN. 
Pericera triangulata, sp. nov. 
Plate Xxxx1I, fig. 1. 
Carapace triangular-ovate, covered with a short, close pubescence. 
Median spines nine; four on the gastric region, of which the one next 
the posterior is the longest; one, tuberculous, on the genital region; 
two on the cardiac, the anterior one the longest of the median spines; 
and two on the intestinal, the last one projecting almost horizontally 
over the posterior margin. There are two long spines arranged length- 
wise through the center of each branchial region, the anterior one being 
much nearer the median line. A little farther forward on the branchial 
region, and in a transverse line with the posterior gastric spine, there 
is a tubercle. On the branchial there is also a tubercle just above the 
margin midway between the first and second lateral spines; and a line 
of three faint tubercles, almost parallel with the antero-lateral margin 
and between the margin and the dorsal branchial spines. There is a 
small tubercle on the hepatic region, and a spiny tubercle on the 
anterior part of each gastric region, almost in line with the first median 
spine. 
— Rostral horns straight, widely divergent, with fine hairs on the mar- 
gins. Preocular spine long, acuminate, strongly upturned; postocular 
sharp; sinus wide. 
Antero-lateral margin slightly convex, armed with three triangular 
acute spines: one on the hepatic region; one at the lateral angle of the 
carapace pointing outward and backward; the other half way between, 
almost parallel with the hepatic spine. From the last lateral spine to 
the last median spine the margin is marked by an almost straight 
ridge. 
3asal joint of the external antenna with a short tooth at its antero- 
external angle, and a tubercle at the insertion of the next joint. Re- 
maining joints with afew long marginal ciliex. Antenna a little longer 
than the rostrum and inserted underneath it. 
Abdomen of immature female with an uneven carina through the 
center, caused by a tubercle on each segment. 
Chelipeds no longer than first pair of ambulatory legs, slender. 
Merus tuberculous above; hand long, slender, somewhat compressed, 
slightly tapering. The chelipeds, with the exception of the hands and 
fingers, and the ambulatory legs, are clothed with a soft, thick pubes- 
cence. 
Entire length, 18.7 ; width, including second lateral spines, 13.2; width 
without spines, 10.2; width between tips of postocular spines, 8.3. milli- 
meters. 
A single specimen was dredged in the Gulf of California, lat. 28° 28/ 
N., long. 112° 04’ 30” W., 29 fathoms, gray sand, temperature 62.99, 
station 4014, 1889 (16066). 
ps 
‘ 
