550 PROCEEDINGS OF TEE NATIONAL MUSEUM. vol.50. 



are two on the anterior slope side by side. Three median spines, the 

 posterior the largest, on the gastric region ; a transverse row of four 

 tubercles or spines, in a line between the first and second median; 

 behind the outer ones of this row there is another in transverse line 

 with hinder median spine ; two small tubercles near posterior border 

 of mesogastric region. The longest spines of the carapace proper 

 are two on the margin of each branchial region ; in front of each spine 

 there is a tubercle while between them and farther in there is a 

 smaller spine; a ring of granules near the inner angle; besides sev- 

 eral other granules and tubercles on the gastric as well as on the 

 branchial region. A flattish spine on hepatic region. A stout, 

 curved, acute spine above posterior margin. Subbranchial and ptery- 

 gostomian regions spinous, the anterior spine largest. 



Eostral horns nearly as long as carapace, slender, curved, diver- 

 gent from their bases, a little convex toward each other and a little 

 convex upward in a side view; they lack the accessory spine or 

 spinule commonly found in species of this genus. Preorbital hoods 

 long and narrow, inclined toward each other anteriorly, outer margin 

 nearly straight, and posterior margin transverse, forming an acute 

 dentiform angle; anterior end produced in a long, narrow, sharp 

 tooth. On upper margin of orbit, a small triangular tooth close to 

 the postorbital cup; the latter angular, upper surface rhomboidal, 

 outer surface larger, subrectangular. Basal antennal segment longi- 

 tudinally grooved, armed at the anterior angle with a slender spine, 

 visible from above; further back on the the margin there is a shallow 

 lobe. 



Chelipeds slender, the manus slightly wider than the merus and 

 enlarging a little distally; surface finely granulate. Fingers about 

 one-third as long as manus, gaping in basal half. Merus armed 

 with 3 spines above and 2 below, all of medium length. The 

 merus of the ambulatory legs, besides the long terminal spine, has 

 from 3 to 5 other irregular spines. The carpus bears 2 spines above 

 on the distal half; they are insignificant on the last 2 legs. The 

 dactyli are armed with from 8 to 12 sharp spinules visible to my 

 unaided eye. 



The under side of the crab is ornamented with lines of globular 

 setae. The first to sixth segments, inclusive, of the abdomen bear a 

 median spine or tubercle. 



RelationsMp. — This pretty little species differs from all others in 

 lacking an accessory spinule on the rostral horns and in having 

 more than one spine on the merus joint of the legs. The orbits, how- 

 ever, are of typical form. It is perhaps nearest to N. taurus Pocock,^ 

 which also has granulated chelipeds and divergent horns, but the 



1 Compare lUus. Zool. Investigator, Crust., pt. 6, pi. 33, figs. 5, 5a. 



