276 PULLETIN 9*7, UNITED STATES NATIONAL MUSEUM. 



Diagnosis. — Small. Fronto-orbital width more than two-thirds of 

 greatest width. Second and third side teeth slender, acute. Legs 

 nearly naked. 



Description. — Dorsal surface uneven, with numerous irregular, 

 shallow punctures, and along the lateral borders with small tuber- 

 culous elevations. Cervical suture a distinct sulcus. Mesogastric 

 region separated from protogastric lobes by deep sulci, which unite 

 between these lobes and extend down the front as a broad and deep 

 depression. Epigastric lobes very prominent, their anterior margins 

 transverse and precipitous. Protogastric lobes well indicated, having 

 an outer lobe separated as a small but very distinct tuberculiform 

 elevation opposite the fissure of the orbit. Epibranchial lobes uneven 

 and partly separated from the mesobranchial by well-marived, out 

 short, depressions. Posterior portion of branchial region divided by 

 a longitudinal ridge into a flat inner area, and a broad precipitous 

 portion between the ridge and the lateral margin. 



Front, as seen from before, very sinuous, and broken in the middle 

 by a broad, deep, rounded sinus : its outer angles, as seen from above, 

 obtusely rounded, the margin continuous to the inner angle of the 

 orbit, where it passes abruptly downward beneath the ocular peduncle 

 as a sharji ridge, leaving a distinct notch, above M^hich the margin 

 begins again and is continuous to the acutely triangular antero-laleral 

 tooth, which is prominent and directed straight forward. Next 

 tooth, or first tooth of the lateral margin, broad, obtusely rounded, 

 and above the plane of the orbital tooth; second and third teeth 

 slender, acute; last tooth on the postero-lateral margin small, acute, 

 and sorneAvhat below the level of the preceding ones. Inferior margin 

 of orbit straight, finely dentate. Infero-lateral regions granulous, 

 slightly hairy. 



Chelipeds short, very unequal. Merus short, not reaching beyond 

 margin of carapace, triquetral, angles denticulate. Carpus small, 

 outer face granulous, inner edge slightly margined. In the larger 

 hand the propodus is short and very stout, outer surface convex and 

 finely granulous; pollex very short, its prehensile edge directed ob- 

 liquely downward. Dactylu.s straight, rather slender, granulous. 

 Both fingers obtusely tubercular on the prehensile edges; tips horny, 

 slightly excavate. Smaller hand slender, somewhat flattened, the 

 angles armed with sharp spinules. 



Abdomen of male broadest at its base, from which it tapers to the 

 last segment, which is longer than broad and rectangular, except that 

 the extremity is rounded. Appendages of first segment stout, sud- 

 denly constricted near the end on the under side, and curved outward 

 and strongly doAvnward to the tip. 



Measurements. — Male holotype, length of carapace, including 

 frontal lobes, 12.4, width of same 15, antero-lateral width 11.5, 



