1869.] 275 [Smith. 



Xantho denticulahis-Whhe, 1 Annals „and Mag. Nat. Hist., 2d 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 prominent, 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 sloj3e and margin crossed obliquely by a slight furrow. 

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

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

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

 with about nine spiniform 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 antenna? 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 Reefs, 16.6 

 iniilim. ; breadth, including teeth, 26.5 millim. ; ratio of length to 

 breadth, 1: 1.66. 



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

 Bermuda; J. M. Jones. 



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

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

 in the areolation of the carapax, 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 

 Hiatoire naturelle des Crustaces. There have already been described 

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

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



1 Stimpson, being apparently unaware of White's species, has described (Aiinals 

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

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





