GRAPSOIDEA. 341 



equal, carpus, hand, and upper finger neatly granulous above, hand 

 externally smooth or nearly so and not costate, arm at anterior 

 margin about five-dentate. Posterior feet broad, fourth and fifth 

 joints and tarsus with the margins long and sparingly hairy. The 

 third joint with a spiniform seta at apex and no tooth; tarsus rather 

 stout and tapering. 



The posterior margin of the epistome bordering the buccal area is 

 very nearly straight, and even with the level of the outer maxillipeds, 

 and nine or ten denticulate. Third joint of outer maxillipeds oblong. 

 Inner margin of third joint naked, except at base. The ptery- 

 gostomian region is pubescent. There is a distinct and deep emargi- 

 nation at the outer extremity of the orbit. 



Grapsus crinipes. 



G. livido affinis. Carapax nudus, sublqivis, fere quadratus, fronte sat 

 abrupto, margine antero-laterali 1-emarginafo. Pedes anticifere cequi, 

 carpo manu digitoque mobili super ne granulatis, manu extus fere Icevi, 

 nee costatd; bracliio ad apicem anticum 5-7 -denticulate. Pedes postici 

 sparsim criniti, articulo tertio lato, tarso perangusto, lineari, paulo 

 curvato. Margo epistomatis posticus valde arcuatus. 



Near G. lividus. Carapax nude, nearly smooth, subquadrate, front 

 rather abrupt, antero-lateral margin with one emargination. Ante- 

 rior feet nearly equal, carpus, hand, and moveable finger granulous 

 above, hand externally nearly smooth and not costate ; arm with 

 five to seven teeth at anterior apex. Posterior feet sparsely long, 

 hairy, third joint broad, tarsus very narrow and not at all tapering. 

 Posterior margins of epistome much arcuate. 



Plate 21, fig. 6 a, outer maxillipeds, enlarged two diameters ; b, 

 outline of part of arm, natural size ; c, leg of fourth pair, enlarged two 

 diameters ; d, hand of female, natural size. 



Sandwich Islands. 



Length of carapax of female, nine and three-fourths lines ; breadth, 

 eleven and a half lines ; length of front, four and three-fourths lines ; 



86 



