1900.] A. Alcock — Carcinolog leal Fauna of India. 307 



In the Indian Museum is a single specimen from the Andamans : 

 its carapace is 4 millim. long and 7 raillim. broad. 



This species differs but little, except in the sub-quadrilateral shape 

 of the thorax, from the Libystes nitidus described and figured by M. A. 

 Milue-Edwards. 



Catoptrus, A. M. Edw. 



Catoptrics, A. Milne Edwards, Ann. Sci. Nat. Zool. (5) XIII. 1870, p. 82 : 

 Ortmann, Zool. Jahrb., Syst. VII. 1893-94, p. 685. 



Goniocaphyra, de Man, Archiv fur Naturges. LIII. 1887, i. p. 339. 



Carapace transversely elongate-elliptical, without distinction of 

 regions, moderately convex in both directions. 



The extent of the fronto-orbital border is vastly less than the 

 greatest breadth of the carapace, the antero-lateral borders, which are 

 serrated, are therefore well curved. Front straight, slightly notched 

 in the middle line, not distinctly separated from the supra-orbital 

 angles, less than a third the greatest breadth of the carapace. 



Orbits shallow, their upper border entire. The antennal flagellum, 

 which is of good length, stands in the orbital hiatus. The antennules 

 fold transversely. 



Buccal cavern, palate, and external maxillipeds as in Eucrate. 



Chelipeds much as in Libystes, Legs as in Libystes, except that 

 the last pair, though they have the dactylus compressed and ciliated, 

 are never paddle-like. 



Abdomen as in Libystes. 



Distribution : Indo-Pacific (Mauritius to Samoa). 



Catoptrus really differs from Libystes only in the form .of the merus 

 of the external maxillipeds and of the last pair of legs, which are not 

 paddle-like as they are in one species of Libystes, 



10. Catoptrus nitidus, A. M. Edw. 



Catoptrus nitidus, A. Milne Edwards, Ann. Sci. Nat., Zool., (5) XIII. 1870, 

 p. 82 : de Man, Notes Leyden Mus. XII. 1890, p. 67 : Ortmann, Zool. Jahrb., Syst., 

 VII. 1893-94, p. 687. 



Coniocaphyra truncatifrons, de Man, Archiv fur Nat. LIII. 1887, p. 339, pi. xiv. 

 fig. 1, and Notes Leyden Mus. XII. 1890, p. 67. 



Goniocaphyra sp., Zehntner, Rev. Suisse Zool. II. 1894, p. 163, pi. viii. fig. 12, 

 12a. 



Carapace, length less than two- thirds its breadth, perfectly smooth 

 and shining except for some fine granulation near the antero-lateral 

 borders. 



