338 



38 



margin of the first sternal segment; extremity of each appendage broadly oval. The 

 abdomen of the mature female almost covers the sternum except at the posterior 

 angles; margin of terminal segment trilobate. 



Length of type J" 42 mm., width 68 mm., fronlo-orbital width 28 mm., edge 

 of front 1-3 mm., posterior margin 46 mm. 



Type locality. — Outside mangroves at Koh Chang, very shallow water; 

 III. 18 ;3 (} (1 is type), 1 $ ovig. 



Fig. 22. Xenophihalmus pinnotheroides, 



Koh Kut : a, anterior half of cf, (>'6 mm. 



wide; b, chela of same; c, cliela of Ç, 



; 7-1 mm. wide; d, maxillipeds; 



e, abdomen of cf. 



Subfamily Xenophthalmlnæ. 

 Xenophthalmus pinnotheroides White. 



Xenophthalmiis pinnoteroides Alcock, LXIX, 332, 1900. 



Between Koh Kahdat and Koh Kut, 6 falh., 

 sandy clay; I. 9; 1 ?. North of Koh Kut, 10 fath.; 



I. 23; 1 c? 1 ? 1 juv. 



These specimens are all smaller than that 

 figured by White (Ann. Mag. Nat. Hist., XVIII, pi. 



II, fig. 2, 1846, and Zool. Samarang, Crust., pi. XII, 

 fig. 3, 1848), the largest, a female from Koh Kut, 

 measuring 75 mm. wide. The legs are slenderer 

 than represented by White, but probably as in 

 the species below, X. obscurus, the legs are stouter 

 in the adult than in the young. 



Carapace and legs pubescent. Chelipeds of 

 male, while not much longer than in the female 

 are considerably more enlarged, the chelæ suboval 

 margined above and below. The propodus of the 

 first leg is as broad as long. 



Xenophthalmus obscurus 



Henderson. 



Plate II, fig. 13. 



Xenophthalmus obscurus Ai.cocK, 

 LXIX, 333, 1900. 



The Sound at Koh Chang, 

 3 — 5 fath., soft clay bottom ; 

 XII. 24 to I. 6; 13 J" 20? (2 

 ovig.) 4 juv. West coast of 

 Koh Chang, a little north of 



Fig. 23. Xenophihalmus obscurus, Koh Kut, d, ill mm. wide: *'^^ small islands, 10 fath., 

 a, anterior half; b, antenna; c, chela; d, ma.\illipeds; e, abdomen, mud bottom, dead shells; I. 



