36 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



Description. — Carapace smooth and shining, convex fore and aft, 

 as well as from side to side; antero-lateral margin less than half as 

 long as the postero-lateral, and armed with three strong teeth, includ- 

 ing the angle of the orbit ; carapace widest at the third tooth. Front 

 deeply notched on each side at the insertion of the antennae; inter- 

 antennal margin nearly straight. 



Chelipeds in the male with a deep round pit at anterior distal 

 corner of lower surface of merus ; this pit is surrounded by a fringe 

 of long hair; a sharp curved spine near the distal end of the upper 

 surface of the merus. Carpus with a sharp inner spine; inner 

 surface pilose. Ambulatory legs slender. 



Carapace of female narrower. Chelipeds more nearly equal. 

 Merus without pit and surrounding hair. 



Color. — Distal half of fingers white. 



Measurements. — ^lale (15012), length of carapace 15, width of 

 same 24.9 mm. 



Range. — Florida Keys, Gulf of Mexico and "West Indies. Shallow 

 water to 49 fathoms. 



Material exainined. — See page 35. 



Localities recorded. — Key West, 2 to 5 fathoms, and off Elbow 

 Eeef, 49 fathoms (Stimpson) ; Sarasota Bay (Kingsley) ; Egmont 

 Key (Smith) ; New Orleans (M. C. Z.) ; St. Thomas (Stimpson). 



EURYPLAX POLITA Smith. 



Euryplax politus Smith, Trans. Connecticut Acad. Arts ancl Sci., vol. 2, 

 1870, p. 163 (type-locality, Panama; t5'pe in P.M.Y.U.). 



Diagnosis. — Antero-lateral margins parallel. Arm of male with- 

 out a deep pit. Fingers brown at tips. 



Description (after Smith). — Carapace glabrous, convex longitudi- 

 nally and very slightly transversely. Dorsal surface not distinctly 

 areolated, although the cervical suture can be traced by a slight de- 

 pression. Front nearly straight, a distinct marginal groove on the 

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

 antennae. Antero-lateral margins parallel, very short, armed with 

 three acute teeth. Postero-lateral margins slightly incurved. Pos- 

 terior margin slightly concave in the middle. 



Chelipeds nearly equal, stout, smooth, and glabrous. Merus armed 

 Tkith a small spiniform tooth; carpus with a small tooth within. 

 Hands slightly swollen, superior margins high, but smooth and 

 rounded; fingers slender, slightly deflexed. Legs smooth, nearly 

 naked, very slender. 



Appendages of first segment of male abdomen not so strongly 

 curved at the tips as in E. nitida, and the terminal portion brown 

 instead of black. 



