LEUCOSOIDEA. 397 



pairs of legs extends out very nearly as far as the apex of the lateral 

 spine. 



The outer raaxillipeds are like those of the genus Arcania, the 

 third joint being rounded at apex. The body of the palpus extends 

 as far forward as the apex of the third joint of the organs, and has 

 nearly the same width. 



GENUS NUCIA. 



Carapax parce transversus, antice non producing, latere nan dilatatus, 

 inermis, superficie paulo tuberculatus, fronte bilobatus et non saliens. 

 Oculi paulo remoti, grandiores, marginales. Area buccali sbene tri- 

 angulata. Maxillipedis externi articulus Stilts triangulatus ; palpus 

 angustus, extus rectus, Pedes toti breves et crassi, digiti in piano sub- 

 verticali claudente, eodem cum manus articulatione. 



Carapax sparingly transverse, not produced in front, sides not dilatate, 

 unarmed with spines, surface somewhat tuberculate, front bilobate, 

 and not salient. Eyes rather remote and large, marginal. Buccal 

 area neatly triangular. Third joint of outer maxillipeds triangular; 

 palpus narrow, on outer side straight. Feet all short and stout, 

 fingers opening nearly in a vertical plane, in the same plane with 

 the articulation of the hand with the carpus. 



NUCIA SPECIOSA. 



Carapax obesus, latere 5Q-tuberculatus, supra utrinque 56 tuberculis 

 obsoletis ornatus, undique bene granulatus, postice area prominente 

 tuberculisque juxta marginem duobus ornatus. Pedes perbreves, 

 brachio parce exserto, digitis bene canaliculatis. 



Carapax obese, with five or six tubercles along either side, and above, 

 either side of middle, five or six obsolescent tubercles; whole surface 

 neatly granulate, behind having a prominent area, and below it on 

 the margin two tubercles. Feet very short, arm sparingly exsert, 

 fingers deeply channeled. 



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