184 A. Alcock — Carcinological Fauna of India, [No. 1, 



sharp pearly tubercles like those on the carapace : the inner angle of 

 the wrist is somewhat produced and forms a double-crowned tubercle. 



The whole animal has a harsh feel, due partly to the roughness of 

 the surface and partly to the presence of very short, stubbly, scattered 

 bristles. 



Colours in spirit, light red or madder, fingers darker, dactyli of 

 legs blackish. 



In the Indian Museum are two specimens, from Mergui and the 

 Nicobars. 



Epixanthus, Heller. 



Epixanthus, Heller, SB. Ak. Wien, XLIII. 1861, i. p. 323. 



Epixanthus, A. Milne Edwards, Ann. Sci. Nat., Zool., (4) XX. 1863, p. 290 ; and 

 Nouv. Archiv. du Mas. IX. 1873, p. 240. 



Epixanthus, de Man, Journ. Linn. Soc. Zool. XXII. 1887-88, p. 45. 



Carapace very broad, transversely oval, either moderately convex 

 or almost flat, the regions very obscurely marked. 



Antero-lateral borders long, strongly arched, with a thin sharp 

 edge, usually regularly fissured or dentate : postero- lateral borders 

 strongly convergent. 



Front broad (from one-fourth to nearly one-third the greatest 

 breadth of the carapace), slightly deflexed, separated from the supra- 

 orbital margin by a notch, cut into four teeth or lobes. Either a suture 

 or a gap beneath outer angle of orbit. 



Antennules folding transversely, inter-antennulary septum broad. 

 Basal antennal joint very broad and short, largely in contact with the 

 front ; flagellum very short (less than half the major diameter of the 

 orbit), lodged in the orbital hiatus. 



The ridges of the endostome, defining the expiratory canal, are 

 very strong, but the anterior border of the merus of the external 

 maxillipeds is either not at all or only very slightly notched. 



Chelipeds massive, unequal in both sexes ; fingers long, pointed, 

 those of the smaller hand being remarkably long and slender. 



Abdomen of the male with all 7 segments distinct. 



Key to the Indian species of Epixanthus. 



I. Carapace nearly flat, nearly smooth ; antero-lateral 

 border divided by very short narrow fissures into four 



broad shallow lobes E. frontalis. 



II. Carapace convex, scabrous; antero-lateral border deep- 

 ly cut into five sharp thin teeth E. dentatus. 



