388 BULLETIN 129, UNITED STATES NATIONAL MUSEUM 



to 150 fathoms (A. E. Verrill). Martinique (A. Milne Edwards). 

 Bermuda (A. E. Verrill). 



Material examined. — 



Antilles; 2 females, cotypes (Geneva Mus.). 



Off Havana, Cuba; lat. 23° 10' 48" N.; long. 82° 19' 15" W.;' 

 121 fathoms; fne. gy. Co.; Jan. 17, 1885; station 2330, Albatross; 

 1 carapace (9502). 



Between Jamaica and Haiti; lat. 17° 43' 40" N.; long. 75° 38' 

 25" W.; 52 fathoms; Co. brk. Sh.; Feb. 29, 1884; station 2136, 

 Albatross; 1 male (7760). 



Soufriere Bay, Dominica; 100 fathoms; A. H. Verrill; 1 female 

 (32717). 



Bahia, Brazil; shallow water; H. M. S. Challenger; 1 small male 

 (Copenhagen Mus.). 



MITHRAX (MITHRAX) ACUTICORNIS Stimpson 



Plate 136, figs. 1 and 2; plate 257, fig. 1 



Mithrax acuticornis Stimpson, Bull. Mus. Comp. ZooL, vol. 2, 1870, p. 116 

 (type-localities, off the Quicksands [Florida], 34 fathoms, and west of the 

 Tortugas, 37 and 42 fathoms; types not extant). — A. Milne Edwards, 

 Crust. Reg. Mex., 1875, p. 98.— Rathbun, Bull. U. S. Fish Comm., 

 vol.. 20, for 1900, part 2 (1901), p. 66 (part). — A. Milne Edwards and 

 BouviER, Mem. Mus. Comp. ZooL, vol. 47, 1923, p. 390, pi. 11, fig. 11, 

 text-figs. 22 and 23 ($?). 



Nemausa rostraia A. Milne Edwards, Crust. R^g. Mex., 1875, p. 81, pi. 17, 

 fig. 4 (type-localities, west of Florida, lat. 26° 16' N., 20 fathoms; near 

 Mujeres, Yucatan, 12 fathoms; Martinique; cotypes, 1934, 1935, 1936, 

 M. C. Z.). 



Mithrax (Nemausa) acuticornis Rathbun, Proc. U. S. Nat. Mus., vol. 15, 

 1892, p. 260 (part), pi. 37, fig. 1. 



Diagnosis. — Small. Carapace with lateral angle. Two supra- 

 orbital spines between preorbital and postorbital spine. Fourth 

 lateral spine at lateral angle of carapace and behind the line of the 

 gastro-cardiac suture. A small spine on basal antennal article at 

 articulation of next article. 



Description. — A -small species. Carapace distinctly longer than 

 broad, forming an angle at the meeting of the antero-lateral and 

 postero-lateral margins. Cervical and cardiac sutures deep. Sur- 

 face covered with sharp spines which are very short and scanty on 

 the gastric region, longer and more numerous elsewhere. Rostral 

 horns straight except for a slight curving inward at the tip, divergent, 

 regularly tapering, and varying in length from one-seventh to one- 

 sixth of the length of the remainder of the carapace. Principal 

 spine of basal antennal article straight or slightly curved and half as 

 long as rostrum; two other spines on the article, one of which forms 

 part of the orbital border and the other, very small, lies at the base 

 of the following, or first movable, article; in the larger specimens 



