S. I. Smith on American Crustacea. 163 



men is nan-ow and tapers to a very narrow terminal segment, which 

 is two-thirds longer than broad, and obtuse at tip. The appendages 

 of the fii'st segment extend a little beyond the sixth segment. They 

 are widely separated at base, strongly incurved till they meet a little 

 way from the tips, which are again curved strongly outward. They 

 are slender and taper to slender and acute tips, and the terminal third 

 is shining black in color. The apj^endages of the second segment are 

 situated within those of the first, are short, slender, straight, and 

 white. 



Alcoholic specimens are pale yellowish white, and the fingers white 

 at tips. 



Lenprth of Breadth of Breadth 



Locality. Sex. carapax. carapax. Katio. of front. 



Florida. Male. 13-4mm 22-Omm i ; i-64 10-2mm 



New Orleans? " 14-6 240 1 : 1-65 10-4 



Euryplax politus, sp. nov. 



This species is allied to the last, but wants wholly the pits on the 

 meral segments of the chelipeds, and the antero-lateral margins are 

 parallel instead of converging anteriorly. 



Male. The carapax is glabrous, convex longitudinally and very 

 slightly transversely. The dorsal surface is not distinctly areolated, 

 although the cervical suture can be traced by a slight depression. 

 The fi-ont is nearly straight and has a distinct marginal groove upon 

 the upper edge and is deeply notched each side at the insertion of the 

 antennae, as in M nitidtis. Tlie antero-lateral margins are parallel, 

 very short, and each is armed with three acute teeth. The postero- 

 lateral margin is slightly incurved. The posterior margin is slightly 

 concave in the middle. 



The chelipeds are nearly equal, stout, smooth and glabrous. The 

 merus is armed with a small spiniform tooth, as in E. nitidus, and 

 the carpus, with a small tooth within. The hands are slightly swol- 

 len, the superior margins are quite high, but smooth and rounded, 

 and the fingers are slender and slightly deflexed. 



The ambulatory legs are smooth, nearly naked, and very slender. 



The abdomen is quite similar in form to that of E. nitidus, and the 

 appendages are very much as in that species, but those of the first 

 segment are not as strongly curved at the tips, and the terminal por- 

 tion is brown instead of black. 



An alcoholic specimen is pale yellowish white, ■with the fingers 

 brown at tip. 



Length of Breadth of Breadth 



Sex carapax. carapax. Ratio. of front. 



Male. Q-9rnm ll-2mm 1:1-63 4-4mm 



A single specimen was collected at Panama by F. H. Bradley. 



