BARBADOS-ANTIGUA REPORTS 73 



angle of the orbit; the first and often the second spine is bifid. In the 

 Barbados specimen, there is a spine immediately following the orbital spine, 

 which is subequal to it, and the second spine also is double, composed of 2 

 separate spines, the hinder of the two being smaller; in short, the margin 

 appears to be 6-spined. Two spines on the dorsal surface of the hepatic 

 region and one on the branchial region near by, are larger than usual. The 

 outer surface of the larger as well as of the smaller palm is rough all over. 



Not previously known south of Guadeloupe. 



PiLUMNUS BARBADENSIS, Sp. nOV. 



Plate I 



Type-locality. — Barbados ; from old coral heads ; May 31 ; 3 5 

 2 9 ; the largest 6 has been selected as the holotype. (Cat. No. 

 , Mus. Univ. Iowa.) 



Additional lots. — Okra Reef, Barbados; May 13; 2 young. 

 Barbados ; from coral heads ; June 4 ; 5 small. 



Measurements. — Male holotype, length of carapace 6.7, width 

 9.4 mm. The largest 9 is 12.3 mm. wide and too broken to per- 

 mit measurement of the length ; figured 9 , length 7.6, width 

 10.7 mm. 



Description. — Carapace suboval, anterolateral margin arched but shorter 

 than the postero-lateral margin. Surface covered with a short, soft, sparse 

 pubescence which does not conceal the carapace. Furrows between regions 

 and gastric subregions well marked. Surface minutely roughened, especially 

 along the front and antero-lateral regions where the granules are acutely 

 pointed. The lobes of the front are oblique, slightly convex save at outer 

 end which is right angled ; edge crenulate. Inner orbital angle acute, 

 elevated; upper orbital margin sloping obliquely outward and backward to 

 a slight outer tooth. Edge of orbit finely denticulate. Antero-lateral 

 margin armed with 3 slender, acuminate spines, each set in a stout, trian- 

 gular, denticulate base. The carapace is widest at the posterior pair of 

 these spines; the two interspaces are subequal; between the anterior spine 

 and the orbital angle there is a spinule, little larger than the sharp denticles 

 of the neighboring surface, and confused in dorsal view with several sub- 

 hepatic spinules. Suborbital region covered with coarse, acute granules. 

 Lower orbital region more advanced than upper, its spinules more elongate; 

 spinule at inner angle a little larger and more pronounced. 



Chelipeds very unequal, thinly clothed with longer hairs than the cara- 

 pace; carpus covered with acute granules, and with two spinules. one above 

 the other at the inner angle. Only the proximal third or less of the major 

 palm is rough with granules, the roughness forming an oblique band border- 

 ing the carpus but stopping short of the lower margin; the proximal two- 



