540 ME. w. F. L/VxcnESXEii ON THE [Dec. 3, 



laterally and beneath to the neighbourhood of the carpal articula- 

 tion ;_ in the others it readies quite a little way on to the lower 

 border of the hand. 



Dim. J 10 X 7. 6 10-25 X 7. c^ 10 X 7. 6 9-5 x 6-5. 

 d 7x5. $10x7. $10x7. $7-5x6. $8x5-5. 



X. Genus Leptodius A. M.-Edw. 



13. Leptodius exaeatus M.-Edw. 



Cliloroclias exaratus,M.-'E\\y. Hist. Nat. Crust, i. p. 402 (1834). 



Xaiitho ajflais, de Haan, Crust. Japon. p. 48, pi. xiii. fig. 8 

 (1839). 



Leptodius exaratiis, A. M.-Edw. Nouv. xirch. Mus, ix. p. 222 

 (1873) ; de Man, Zool. Jahrb. viii. p. 521 (1895). 



Loc. Pulau Bidan, Penang. 



Two males and a female. 



Dim. S 18x10-5. S 14-5x10. $10x7. 



14. Leptodius cayipes Dana. 



Chlorodlus cavipes, Dana, CJ.S. Expl. Exp. p. 212, pi. xii. fig. 1 

 (1852) ; de Man, Mergui Crust, p. 34 (1888) ; Alcock, Journ. As. 

 Soc. Bengal, Ixvii. 2, p. 122 (1898). 



Loc. Pulau Bidan, Penang. 



A male and a small female. 



The " wrinkling " oji the chelipedes in the male tends to the 

 formation of deepish wide-mouthed pits on the carpus and to a 

 slight degree on the upper margin of the hand. In the female the 

 two lobes of the front are much more prominent near the middle 

 line than at the sides, giving it a cupid's-bow-shaped appearance; 

 the grooves, too, on the sides of the carapace are more marked 

 than in the male. 



Dim. d 20-5x13-5. $ 13-5x9. 



XL Genus Xantho Leach. 



15. Xantko scabee Fabr. 



Cancer scaber, Eabr. Ent. Syst. Suppl. p. 336 (1798). 



Xantlio scaber, M.-Edw. Hist. Nat. Crust, p. 390 (1834). 



Loc. Kelantan. 



One male. 



This single individual agrees entirely with the descriptions cited, 

 so far as they go. The tubercles on the middle regions of the 

 carapace are smooth and rounded, on the sides and front they 

 become conical : those on the outer faces of the wrists and hands 

 are rounded, but larger than those on the middle regions of the 

 carapace, and pointed tubercles are present on the upper borders 

 of the carpus and propodus of the walking-legs. The pterygo- 

 stomian regions are covered with rather flattened granules and are 

 deeply grooved, the grooves being continuous with those between 

 the ill-defined lateral teeth ; these latter are four in number, of 



