18G9.] 283 [Smith. 



Panopeus planus, sp. no v. 



Carajjax naked, very broad, depressed and very flat above ; front 

 and sides crossed by numerous granulous rug£e ; areolation very dis- 

 tinct, the gastric region surrounded laterally and posteriorly by a 

 deep groove, a deep groove extending from the anterior extremity of 

 the median gastric lobe to the middle of the front, and a similar 

 groove separating the hepatic from the branchial region, and joining 

 the middle incision of the antero-lateral margin. Front nearly hori- 

 zontal, scarcely at all prominent, the edge slightly thickened and 

 granulous, a very little arcuate in the middle, with a slight median 

 incision, and the lateral angles projecting as small teeth, nearly or 

 quite to a line with the middle. First lobe of the antero-lateral 

 margin broad, not at all advanced, and its edge straight; remaining 

 lobes not at all prominent and separated by very slight notches. Sub- 

 orbital and sub-hepatic regions very much as in P. politus, but rather 

 more strongly granulous and quite pubescent. 



Chelipeds with the carjii and hands smooth and evenly rounded 

 above, the fingers rather slender, slightly deflexed, and with very 

 slight, longitudinal, impressed strias. Ambulatory feet long and slen- 

 der, pubescent along the edges and the dactyli wholly pubescent. 



Length of cai'apax in a male, 16.5 millim.; breadth, .26.4 millim.; 

 ratio, 1: 1.60. 



Panama ; F. H. Bradley. 



This species is at once distinguished from all others in the genus by 

 its very flat carapax. 



Panopeus depressus, sp. nov. 



Carapax depressed, slightly convex, crossed by numerous trans- 

 verse granulous ruga3, and granulous and slightly pubescent on the 

 front and antero-lateral border; regions slightly marked and not pro- 

 tuberant, except the anterior part of the gastric which is somewhat 

 swollen. Front broad, nearly horizontal, not at all prominent, and 

 its edge thin, almost perfectly straight, and with a shght median notch 

 in the larger specimens. First lobe of the antero-lateral margin 

 broad, composed of the angle of the orbit coalesced with the second 

 normal tooth, its edge thin, the inner angle slightly curved forward 

 to form the angle of the orbit, the outer angle slightly rounded; re- 

 maining teeth of the antero-lateral margin separated by deep triangu- 

 lar notches; third normal tooth broad, truncate, its anterior angle 

 sharp, posterior angle rounded; fourth tooth prominent, its anterior 

 edge straight or slightly hooked forward at the apex, outer and pos- 



