1898.] A. Alcock — Carcinohgical Fauna of India. 115 



Chelipeds unequal in both sexes, smooth like the legs. 

 Abdomen of male five-jointed. 



Colours in spirit : dull yellowish brown, fingers almost black. 

 In the Indian Museum are four specimens from the Andamans. 



42. XantJw impressus, (Lamk.) Edw. 



Cancer impressus, Lamarck, Hist. Nat. Anim. sans. Vertebr. V. 272. 



Xantho impressus, Milne Edwards, Hist. Nat. Crust. I. 393 : A. Milne Edwards, 

 Nouv. Archiv. du Mus. IX. 1873, p. 198, pi. vi. fig. 2 : F. Muller, Verb. Ges. Basel 

 VIII. 1886, p. 474 : de Man, Journ. Linn. Soc, Zool, XXII. 1887-88, p. 30: 

 J. R. Henderson, Trans. Linn. Soc, Zool., (2) V. 1893, p. 359: Ortraaun, Zool. 

 Jahrb., Syst. VII. 1893-94, pp. 444, 449. 



Eudora impressa, De Haan, Faun. Japon. Crust., p. 23 : A. Milne Edwards in 

 Maillard's Tile Reunion, Annexe F. p. 4 : Richters in Mobius Meeresf. Maurit. 

 p. 146, pi. xv. figs. 15, 16. 



Carapace very short and broad, little convex in the anterior half, 

 quite flat in the posterior half. 



Gastric and cardiac regions separated from the wings of the cara- 

 pace by very broad and deep furrows, the wings of the carapace being 

 thrown into massive smooth lobules by furrows not quite so deep, but 

 the gastric region being slightly and imperfectly areolate except quite 

 anteriorly. 



Front somewhat declivous, bilobed, not laminar. The four lobes 

 of the antero-lateral margin are thickened and blunt, the first lobe 

 being on a level lower than that of the orbit. Close in front of the 

 thickened posterior border is a smooth transverse wrinkle. 



The tooth and notch at the antero-internal angle of the merus of 

 the external maxillipeds are very distinct. 



Chelipeds equal in both sexes : outer surface of arm with a groove 

 following the contour of the distal border ; outer surface of wrist with 

 a faintish Y-shaped dimple, and a strong double-crowned tubercle at 

 the inner angle of the wrist ; upper surface of hand with an incomplete, 

 longitudinal, pitted furrow ; lingers with cutting-edge coarsely crenu- 

 hite. 



Legs thick, subcylindrical, smooth ; both edges of the dactylopodites 

 covered with thick short fur. 



Abdomen of male 5-jointed, with the sutures between the 3rd-5th 

 joints persistent. 



Colours in spirit : waxy white, fingers blackish brown. The whole 

 animal has a smooth waxy look. 



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

 Andamans (besides three from Mauritius.) 



Tliis is a curious form, connecting Xantho with several other genera. 



