40 THE BRACHYURA. 



Surface finely granulous, with a few ill-marked ridges, the posterior-middle 

 portion nearly smooth. Fronto-orbital width § of entire width ; front | of 

 the former, convex, with a median V-shaped notch and a small outer tooth. 

 Front separated from orbit by a notch and a furrow. Orbits large, nearly 

 tilled by the eyes, and having a small notch above and another just below 

 the outer angle. Antero-lateral teeth 5, the second rounded and partly 

 fused with the small first or orbital tooth ; third and fourth of good size, 

 fifth small. Short grooves run inward from the lateral sinuses. Garapace 

 equally wide at the fourth and fifth teeth. Margin of front, orbits, and teeth 

 granulous. 



The basal segment of the antennae just meets the downward prolonga- 

 tion of the front. The ridge on the palate is well marked anteriorly, and 

 the notch in the epistome, just outside the ridge, is broad and deep. 



Chelipeds unequal in both sexes, short, stout, granulate. The wrist has 

 a distal groove and a stumpy inner tooth. Fingers black, except at the 

 tips, where they are brown, with a white rim on the edge of the shallow 

 spoon. The color of the pollex runs back a little on the palm, more so in 

 the S than in the 9 ; the fingers have shallow grooves and are finely granu- 

 late at the base ; in the <? the fingers gape and the prehensile teeth are 

 small; in the 9, the fingers do not gape, and in the large claw they bear 

 rather large teeth which dovetail together. The tips of the fingers are 

 not enlarged and are hollowed out, but not hooflike. 



Ambulatory legs missing. 



Last 2 segments of $ abdomen short and broad ; abdomen narrowest at 

 distal end of the third or compound segment. 



Dimensions: — $ type, length 3.7 mm., width 5.8 mm., fronto-orbital 

 width 4.3 mm., width of front 2 mm. 



Type locality: — Ponape, Carolines; reef; Feb. 11, 1900; 1 $ type, 

 1 9 (Cat. No. 32,847, U. S. N. M.). 



Differs from typical Leptodius in its more regularly oval form, in the 

 conspicuous granulation of chelipeds and carapace, and in the greater 

 development of the palatal ridge. 



