GRAPSOIDEA. 



inferiore non deflexo. Psdes postici marginibus pubescentes, articulo 

 pedis 4:ti Stio duplo latiore quam 5<ws, apice cum dente acuto armato. 



Carapax wide transverse, naked and smooth, median region deeply 

 circumscribed, lateral margin arcuate, with two emarginations ante- 

 riorly, the first deep, the second obsolescent ; front rather broad, its 

 sides not excavate. Eyes slender, rather short, as long as one-third 

 the breadth of carapax. Anterior feet of male small, smooth, 

 hand naked on outer surface, minutely punctate, and not costate, 

 lower finger not bent downward at all. Posterior feet with pubes- 

 cent margins, third joint of fourth pair twice as broad as fifth joint, 

 and having a spiniform tooth at apex. 



Plate 19, fig. 4 a, male, enlarged two diameters; b, abdomen, ibid.; 

 c, hand, ibid. 



Island of Upolu, Samoan Group. 



Length of carapax of a male, four lines; breadth, five and two- 

 thirds lines; ratio of length to breadth, 1 : 1-42. This species, owing 

 to its arcuate sides, is narrower in front than some distance back, 

 and the anterior outer angle projects much less outward than the 

 tooth behind the first emargination, the sides from this tooth inclining 

 inward instead of outward. The eye scarcely reaches the outer angle. 

 The sides are not indented posterior to the second emargination. The 

 feet are all unarmed. The fingers are very finely denticulate, and 

 there is a low, broad tooth near base of moveable finger. The lower 

 margin of hand and lower finger make a continuous straight line. 

 The inner denticulate margin of the other finger is slightly two-lobed; 

 its outer surface is slightly channeled. The front, as seen in a front 

 view, is truncate below with the centre very slightly prominent. 



M. pacificus, DANA, Proc. Acad. Nat. Sci. Philad., 1851, v. 248. 



SUBFAMILY II. OCYPODESLaE. 



GENUS GELASIMUS. 

 We have separated from Gelasimus the group with equal hands 



