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248 CRABS OF THE FAMILY PERICERID#—RATHBUN. 
behind it another directed upward just over the posterior margin. The 
cardiac region has a spine at its summit. 
Rostrum slightly deflexed, about one-fifth of the entire length of the 
carapace. Horns somewhat scythe-shaped, thick, regularly tapering, 
acuminate; convex to each other, separated at base by a slight cavity, 
then curving inward and in contact for abeut two-fifths of their length, 
finally diverging. Przocular spine prominent, long pointed; postocular 
acute. Basal joint of antenna broad, armed with one long triangular 
spine, parallel with the preocular spine and visible in a dorsal view. 
Pterygostomian regions pubescent, with a few tubercles. Abdomen 
carinated. 
Chelipeds slender, pubescent, a little longer than the first pair of 
ambulatory legs; merus with an irregular spiny ridge above; hands 
tapering; fingers slender, in contact for nearly their whole length. 
Ambulatory legs stout, very pubescent. 
In spite of the long spine of the basal antennal joint, I have placed 
this species in the genus Pericera, because it has the orbits of Pericera 
and the lateral row of spines. The prominence of the antennal spine 
can hardly be said to be a character sufficient to distinguish Pericera 
and Macroceloma, as there is at least one species of Macroceloma in 
which it is not visible from above, M. diplacantha Stimpson. Besides 
this character, contigua can readily be separated from the other known 
species of Pericera by the peculiar rostrum. 
Length including rostrum, 28; width without spines, 16.3; width with 
spines, 21; width between tips of postocular spines, 14 millimeters. 
One female from the Gulf of California, lat. 25° 02/ 45” N., long. 110° 
43’ 30/’ W., 21 fathoms, sand, shells, coralline, station 3005, U. 8. Fish 
Comm., 1889 (16067), and two males from lat. 31° 21’ N., long. 113° 49! 
W., 11 fathoms, sand, broken shells, gravel, temperature 67°, station 
3024 (16975). 
Picroceroides tubularis Miers. 
Challenger Rept., Zool., Xvul, p. 77, pl. x, fig. 1, 1886. 
In one male the rostral horns and preocular spines are longer than 
in the specimen figured by Miers. The largest specimen, a female, 
measures 20.5 millimeters in length from the base of the horns and 13.5 
millimeters in width at the branchial regions. Collected off Havana, 
Cuba, lat. 23° 10’ 25’ N., long. 82° 20’ 24” W., 33 fathoms, station 
2324, coral, temperature 79.1°; by the U.S. Fish Commission steamer 
Albatross, 1885 (9495); also at station 2158, 1884, lat. 17° 44’ 05” N., 
long. 75° 39/ W., 23 fathoms, coral, broken shells (6928). 
This species was collected on the coast of Brazil by the Challenger. 
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