1869.] 275 [Smith. 



Xantho denticulatus White,^ Annals and Mag. Nat. Hist., 2(1 series, 

 Vol. II, p. 285, 1848. 



Carapax naked, anteriorly deflexed and deeply areolated ; gastric 

 region elevated and surrounded laterally and posteriorly by a deep 

 groove, the anterior lobes pi'ominent, the antero-lateral slightly 

 divided anteriorly and separated by a well marked groove from the 

 median, which extends forward in a slender point to the anterior 

 lobes; hepatic region projecting into several obtusely conical tuber- 

 cles, and separated from the branchial region by a deep furrow; 

 antero-lateral. lobe of the branchial region prominently projecting; 

 postero-lateral slope and margin crossed obliqiiely by a sh'glit furrow. 

 Front projecting, slightly deflexed, and with a slight groove along the 

 anterior edge, Avhich is nearly straight as seen from above, but sinu- 

 ous in its margin as seen from before. Antero-lateral margin armed 

 with about nine spiuiform teeth, the anterior one being small, and 

 situated below the level of the others. Inner sub-orbital tooth promi- 

 nent. Latero-inferior regions slightly granulous. Basal segment of 

 the external antennas joining a slight process from the front. 



Chelipeds with the carpus and hand rugose above; the hand smooth 

 below and on the inside, the fingers black and slightly and obtusely 

 toothed within, ambulatory feet nearly smooth, the dactyli slender, 

 compressed, and slightly hairy along the edges. 



Length of carapax in a female from the Abrolhos Keefs, 16.6 

 millim. ; bi'eadth, including teeth, 2G.5 millim. ; ratio of length to 

 breadth, 1: 1.66. 



Abrolhos Reefs, Brazil; C. F. Hartt. Aspinwall; F. H. Bradley. 

 Bermuda; J. M. Jones. 



Xantho Stimpsordi differs from this species in having the front quad- 

 rilobate and the carjii and hands of the chelipeds tuberculated above, 

 in the areolation of the carajjax, etc. 



Panopeus Edw. 



The species of this genus, which, as far as known, is peculiar to 

 America, are becoming quite numerous, although but a single one 

 was known to Milne Edwards at the time of the publication of his 

 Hitttoire naturelle des Crustaces. There have already been described 

 twelve species: — P. Herbstii Edw., P. Harrisii Stimp., P. Wiirde- 

 inannii Gibbes, P, occidentalis Sauss., P. serratus Sauss., P. america- 



^ Stimpson, being apparently unaware of White's species, has described (Annals 

 Lye. Nat. Hist., N. Y., Vol. VII, p. 207, 1860) an allied species from Capo St. Lucas, 

 as Xantho denticulata, which I will here designate as Xantho Slimpsonii. 



