316 



BULLETIN 



UNITED STATES NATIONAL MUSEUM. 



a 



FIG. 152. SESARMA (HOLOMETOPUS) HAN- 

 SBNI, MALE HOLOTYPE. a, ABDOMEN, X 4 ; 

 6, APPENDAGE OK FIRST SEGMENT OP ABDO- 

 MEN, VENTRAL VIEW, X 51. 



behind, and with a curved sulcus parallel to its posterior margin. 

 Surface smooth, punctate and without granulation. 



Superior margin of front uneven, the inner lobes sloping back- 

 ward from the middle. Front more than four times as wide as high : 



lower margin projecting, thin, 

 arcuate in front view, slightly 

 sinuous in dorsal view. 



Hand deep, covered with de- 

 pressed tubercles : superior 

 margin with a thin denticu- 

 late crest. Fingers irregu- 

 larly toothed; the largest 

 tooth of the dactylus is mid- 

 way of its length and fits be- 

 tween the two largest teeth of 

 the pollex. 



Legs of moderate length, 

 merus joints less than two 

 and one-half times as long as 

 wide. 



Measurement is. Male holo- 

 type, length of carapace 13.5, 

 anterior width of same 16.6, posterior width of same 15.5, superior 

 width of front 9.5 mm. 

 Range. West Indies. Only one specimen known. 



SESARMA (HOLOMETOPUS) BENEDICTI Rathbun. 



Plate 93, 



Sesarma recta DE MAN, Notes Leyden Mus.. vol. 14, 1892, p. 249, pi. 10, figs. 



4-4d ; Surinam. Not 8. recta Randall, 1840. 

 Sesarma (Holometopus) benedicti RATHBUN, Proc. Biol. Soc. Washington, 



vol. 11, Apr. 26, 1897, p. 90 (type-locality, Surinam; type in Leyden 



Mus.). 

 Sesarma chiraara OBTMANN, Zool. Jahrb., Syst., vol. 10, 1897, p. 331 



(type-locality, Para; type in Mus. Phila. Acad. Sci.). CALXTAN, The 



Life of Crustacea, London, 1911, pi. 23 (facing p. 182), lower figure. 



Diagnosis. Movable finger remarkably enlarged at base. Cara- 

 pace narrowed behind. Front very wide. 



Description. Carapace transverse, wider anteriorly than poste- 

 riorly, but not markedly so; mesogastric region deeply outlined: 

 hepatic region depressed; surface rough with irregular pits and 

 wrinkles, and on the anterior gastric region with small depressed 

 squamiform granules. 



Front wide, about two-thirds as wide as carapace, and five times 

 as wide as high, increasing in width below ; vertical, surface granu- 



