356 56 



A c? from Koh Kram is about the size of Slimpson's type and resembles his 

 figure. The lobes of the front are more rounded and less oblique than in smaller 

 specimens, edge minutely crenulate, and the median emargination shallower. Carapace 

 very convex both ways. The projections of the chelipeds are sharp, spinulous. 

 Besides the short pubescence of the surface there are numerous long hairs. 



Length of carapace of J", So, width llömm. 



Pilumnus dorsipes Stimpson. 



Plate 1, figs. 3 and 9. 

 Pilumnus dorsipes Stimpson, Smithsou. Misc. Coll., XLIX, 70, pi. IX, fig. 3, 3 a, 1907. 



Koh Kram, 30 fath.; III. 2 and 21; 1? juv. 



Length 79 mm., width 10'4 mm. Corresponds to Alcock's description fairly 

 well. There is a bunch of subhepatic granules. The surface of the wrist and 

 chela is covered with blunt curved spines. Stimpson's figure shows the legs somewhat 

 shorter, and those of the last two pairs broader. 



Pilumnus borradailei Rathbun. 



Plate 1, fig. 8. 

 PUumnus borradailei Rathbun, Proc. Biol. Soc. Washington, XXll, p. 113, 1909. 



Carapace very flat except anteriorly, about ■'/4 as long as broad, covered with 



a dense short pubescence, and long hairs, forming a fringe on the anterior border 



of the carapace and abundant on the chelipeds even to the finger 



tips and on the legs. When denuded, the regions of the carapace 



are fairly well marked, the surface is finely punctate, and towards 



the antero-lateral regions a little granular. 



Fronto-orbital border '/id of width of carapace, Va of this is 



occupied by the front , the two lobes of which are very oblique, 



convex, witli a shallow median emargination, outer angles rectangular, 



rounded off and scarcely separated from the inner angle of the orbit. 



The outer of the two superior fissures of the orbit is small, the 



Fig. 40. Chela inner scarcely discernible ; nolcli below the outer angle broad. 



(denuded) of Antero-lateral margin crossed by three grooves which form four 



,.,.,,, ^, "' shallow lobes with granulated edges, which diminish in size from 

 dailei, Koh Chang, " ° ' 



<3, 9-4 mm. wide, ^he first to the fourth. Postero-lateral margins slightly converging. 

 Chelipeds stout; merus broader than long; carpus almost smooth 

 except for fine granules along the distal margin ; palms wider than their superior 

 length, surface covered with numerous but not contiguous small pearly granules, 

 which are continued half way along the fingers; only the distal half or less of the 

 fingers is dark-colored. Third pair of legs twice as long as carapace. Legs unarmed. 

 Length of type c? 74 mm., width 10 mm., fronto-orbital width 71 mm., width 

 of front 35 mm. 



