CANCROIDEA. 213 



to the eight posterior legs, the thin crests enclosing a cavity ; the crest 

 along the proper dorsal margin of the joint is much the widest. The 

 hands have an uneven surface, the upper side looking a little tuber- 

 culous, but the prominences run into rugae below, and are all granu- 

 lous. The front has a granulous margin. The teeth of the antero- 

 lateral margin are small, and rather isolated. The outer maxillipeds, 

 pterygostomian region, abdomen, and sternum, are short pubescent, 

 and so the under surface of the third joint of all the pairs of legs. 



The fingers of the smaller hand (left in specimen) are spoon-shape. 

 Those of the larger are only imperfectly so, the two terminating in a 

 stout edge nearly semicircular, which two shut upon one another. 



3. Carapax posticl non areolatus, anticl vix areolatus, fere planus out paulo convexus, 

 5 L, 6 L nun quam circumscriptis. 



CHLORODIUS CYTHEEEA. 



C. nigro affinis. Carapax fere Icevis, areolis mediis indistinctis, antero- 

 lateralibus melioribus, angulatis, margine antero-laterali 5-dentato, 

 dentibus N, T svbacutis, E, /S minorihus, T valde prominentiore quam 

 S, ideoque carapacis latitudine T majore quam latitude S. Pedes 

 antid iis C. nigri similes, digitis nigris, fere contiguis. Pedes 8 postici 

 inermes, margine pubescentes. 



Near C. niger. Carapax nearly smooth, medial areolets indistinct, an- 

 tero-lateral distinct and rather prominent and angular, antero-lateral 

 margin five-toothed, teeth N, T subacute or acute, E and S smaller 

 than the others, and S much less prominent than T (hence carapax 

 much broader across from T to T than from S to S). Anterior feet 

 as in C. niger, fingers black, nearly contiguous. Posterior eight feet 

 unarmed, margin pubescent. 



Plate 12, fig. 2 a, female, three diameters; b, extremity of male 

 abdomen ; c, part of outer maxilliped. 



Island of Raraka, Paumotu Archipelago ; also Tahiti and Sand- 

 wich Islands. 



Length of carapax, three and one-third lines ; greatest breadth, five 



54 



