354 CRUSTACEA. 



nudi, articido 3tio triplo longiore quam lato, 5 to supra non pub&- 

 scente, infra partim breviter pubescente, tar so elongato, spinuloso. 



Carapax quadrate, rather broader behind, granulate, not shining, 

 postero-lateral region faint lineolate, sides with an acute margin, 

 anterolateral margin entire, front perpendicular, above four-lobed, 

 frontal margin very slightly excavate at middle. Epistome granu- 

 late. Anterior feet subequal, carpus, hand, and upper finger gra- 

 nulate, granules not seriate, hand entire above. Eight posterior 

 feet narrow, nearly naked, third joint three times as long as broad, 

 fifth not pubescent excepting somewhat so below, tarsus elongate 

 and spinulous. 



Plate 22, fig. 7 a, male, natural size; b, male abdomen and sternum ; 

 c, hand, natural size. 



South America. 



Length of carapax of a male, nine lines ; breadth at middle, nine 

 and a half lines ; in front, nine and one-fourth lines ; length of front, 

 five and one-third lines; length of hand below base of moveable finger, 

 two and a half lines; length of moveable finger, four and three-fourths 

 lines, but it appears less in a vertical view, as it passes very obliquely 

 downward when closed. The carapax has the intramedial areolet 

 very distinct. The sides have an acute edge, which extends from the 

 front angle to the posterior margin of the carapax. 



The species differs from the hmmatochir of De Haan, which also has a 

 narrow third joint to the eight posterior legs, in having shorter fingers, 

 and the fourth and fifth joints of the eight posterior legs not hairy 

 above. The epistome is not smooth as in the quadratus. 



Sesarma trapezium. 



Carapax quadratus, paulo transversus, pos$fc& sensim mul to angustior, 

 granulatus, regione laterali lineolatd, margine antero-laterali integro, 

 f route perpendiculars supra leviter i-lobato, infra lev iter arcuato, 

 medio non excavato. Epistoma granulatum. Pedes antici mediocres, 

 granulati, manu brevi, supra non dentatd, seriatim subtilissime granu- 



