72 A. Alcock — Carcinological Fanna of India [No. 1, 



The posterior border of the dorsum of the carapace is straight but 

 does not form an angle with the postero-lateral borders. 



Orbits large, with no particular dorsal inclination, their major 

 diameter about half the width of the inter-orbital space : the inner 

 angle of the lower border is bluntly acuminate but hardly dentiform. 



Chelipeds granular: arm with squamiform markings, with 2 

 spines on the anterior border and none on the posterior border : wrist 

 costate, with 3 tiny spinules on the outer angle and a strong spine at 

 the inner angle: hands not inflated (in the female at least), carinate, 

 with 3 spines on the upper surface. 



Merus of last pair of legs hardly half as long as broad, with the 

 usual spine near the far end of the posterior border. 



An egg-laden female in the Indian Museum, from the Andamans, 

 has the carapace 7 millim. long and 9 millim. broad. 



Miers and Ortmann regard this species as not distinct from 

 T. dan^, A. M. Edw. (Nouv. Archiv. du Mus. V. 1869, p. 183, pi vii. 

 figs. 6, 7). 



Thalamita, Latreille, A. M. Edw. 



Thalamita, Latreille in Cuvier Regne An., Crust, (ed. 2) Vol. IV. p. 33 (foot- 

 note) : A. Milne Edwards, Ann. Sci. Nat., ZooL, (4) XIV. 1860, p. 228, and Archiv. 

 du Mus. X. 1861, p. 354: Miers, Challenger Brachyura, p. 193. 



Thalamites quadrtlateres, Milne Edwards, Hist. Nat. Crust. I. 457. 



Carapace hexagonal (but, owing to the straiglitness of the antero- 

 lateral borders, with a quadrilateral cast), broad or very broad, de- 

 pressed or little convex, usually with well marked transverse ridges. 



The extent of the fronto-orbital border is usually little less than 

 the greatest breadth of the carapace : the width of the inter-orbital 

 space is from three-fifths to half the greatest breadth of the carapace : 

 and the width of the true front {i.e. excluding the broad inner supra- 

 orbital angles) is from two-fifths to a third the greatest breadth of the 

 carapace. 



Front well separated from the broad supra-orbital angles and cut 

 into 2, 4, or 6 lobes or teeth, not including the supra-orbital angles. 



Antero- lateral borders hardly oblique, forming almost a right angle 

 with the frontal border, very little arched, cut into 5 teeth (including 

 the outer orbital angle) of which the fourth is often rudimentary and 

 sometimes absent. 



Two sutures in the upper border of the orbit : a gap in the lower 

 border, of which border the inner angle is seldom prominent. The an- 

 tennules fold transversely. 



Basal antennal joint having its outer angle enormously produced^ 



