260 A. Alcock — Carcinological Fauna of India. [No. 2, 



II. Carapace strongly carinated or tuberculated, broadly tri- 

 angular (considerably broader than long), with rounded 

 sides and a broad but sharp-pointed projecting ros- 

 trum : no post-ocalar constriction : chelipeds with the 

 arm and hand straight, sharply trigonal, the edges of 

 these joints, as also the outer edge of the carpus, being 

 very sharply and stoutly serrated Platylambrus. 



III. Carapace granular or spiny, usually as long as broad, with 



a projecting rostrum, and a very distinct post-ocular 



constriction Rhinolambrus. 



IV. Carapace granular, broader than long, and with the postero- 



lateral angle produced to form a great blade-like spine. 

 Pterygostomian region deeply channelled, obliquely, the 

 channel being closed below by thick fringes of hairs Aulaco lambrus. 



V. Carapace worn and eroded, broader than long, almost semi- 

 circular in outline, with the postero-lateral angle pro- 

 duced ; the rostrum more or less deflexed, and not, or 

 hardly, breaking the general outline : no post-ocular, 

 but a fairly distinct post-hepatic constriction : cheli- 

 peds with the arm and hand indefinitely contorted, not 

 eharply trigonal ; and with their edges, if spinate, irre- 

 gularly and bluntly so ; the carpus quite smooth exter- 

 nally : the chelipeds are short for the genus Parthenolambrus. 



Sub-genus Lambrus, A. Milne-Edwards. 



Lambrus, A Milne-Edwards, Miss. Sci. Mex. Crust., I. p. 146. 

 Lambrus, Miers, ' Challenger' Brachyura, p. 92, (part.) 



Carapace ovate-pentagonal, with the surface granular or pustular 

 and but little cariuate in the adult : rostrum exceedingly short. 



Lambrus lovgimamis, Leach. 



? Cancer spinosus longimanus, Rumph, Amboin. Rariteitk., pi. viii. fig. 2. 



Cancer macrochelos, Seba, III. xix. 1, 8, 9. 



? Parthenope longimanus, Fabr. Suppl., p. 353. 



? Cancer longimanus, Linn., Syst. Nat., II. 1016, 42. 



f Cancer longimanus, Herbst, Krabben, I. ii, 253, taf. xix. figs. 105, 107. 



Lambrus longimanus, Leach, Trans. Linn. Soc, Vol. XI. 1815, p. 310 j and 

 Milne-Edwards, Hist. Nat. Crust., I. 354 ; and Cuvier, Regne Animal, pi. xxvi. fig. 

 1 ; (and ? Lambrus longimanus, Adams and White, ' Samarang' Crust., p. 30) ; and 

 Bleeker, Crust de l'lnd. Archip., p. 17 (nee syn. pelagicus, Bupp.) ; and Miers, Ann. 

 Mag. Nat. Hist., 1879, Vol. IV. p. 20, and Zoology H. M. S. ' Alert,' pp. 182 and 200, 

 and 'Challenger' Brachyura, p. 95; and W. A. Haswell, P. L. S., N. S. Wales, Vol. 

 IV. 1879, p. 449, and Cat. Austral. Crust., p. 31 ; and A. O. Walker, J. L. S., Zool., 

 Vol. XX. 1890, p. 109 ; and de Man. J. L. S., Zool., Vol. XXII. 1888, p. 21 (ubi 

 synon.) ; and Henderson, Tr. Linn. Soc, Zool., (2) V. J893, p. 349. 



