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



Carapace as long as broad, obovate with the posterior part trun- 

 cated and much constricted, flat, smooth except for a low transverse 

 ridge passing obliquely inwards from the last tooth of either antero- 

 lateral border. 



Front projecting far beyond the well pronounced inner supra- 

 orbital angles, lamellar, horizontal, broadly triangular with the apex 

 rather deeply notched : its breadth (not including the inner supra- 

 orbital angles) is a little less than half the greatest breadth of the 

 carapace. 



Antero-lateral borders curved, cut into 5 anteriorly acuminate teeth 

 (including the outer orbital angles) of which the first is the largest and 

 the 5th the smallest. 



Posterior border of dorsum of carapace forming a curve with the 

 postero-lateral borders. 



Orbits small, their major diameter less than a third the width of 

 the inter-orbital space ; two faint grooves in the upper border, the inner 

 angle of the lower border dentiform but not prominent. 



Chelipeds moderately stout, longer and stouter than the legs, a 

 little longer than the carapace : inner angle of wrist dentiform, two or 

 three little points — of which one is slightly larger than the others — on 

 the outer angle : hand smooth, except for 2 crests — each of which ends 

 in a tooth — on the upper surface, and for a small tubercle in front of 

 the apex of the wrist- joint : fingers stout, a little shorter than the palm. 



Merus of last pair of legs twice as long as broad, its posterior 

 border, like that of the propodite, is smooth and unarmed. 



6th abdominal tergum of male longer than broad, with slightly- 

 curved gradually convergent sides. 



Sternum elongate-oval particularly so in the male. 



In the Indian Museum are 11 specimens, from Madras, from Orissa 

 and Ganjam coasts 13-28 fms., from Malabar coast 28 fms., and from 

 the Andamans. 



A small species : the carapace of an egg-laden female is 7 millim. 

 in both diameters. 



5. Lissocarcinus orbicularis, Dana. 



Lissocarcinus orbicularis, Dana, Proo. Ac. Nat. Sci. Philad. 1852, p. 86, and U. S. 

 Expl. Exp. CroBt. pt. I. p. 288, pi. xviii. fig. la-e : A. Milne Edwards, Archiy. da 

 Mu8. X. 1861, p. 418: Richters in Mobins Meeresf. Maurit. p. 154 : Miers, Zool. 

 H. M, S. Alert, pp. 518, 541, and P. Z. S. 1884, pp. 10, 12, and Challenger Brachyura, 

 p. 205 : Ortmann, Zool. Jahrb., Syst., VII. 1893-94, p. 87. 



Lissocarcinus 'pulchellus, Muller, Verh. Nat. Ges. Basel, VIII. pp. 475, 482, pi. 

 V. fig. 6. 



