1899.] A. Alcock — Garcinological Fauna of India. 81 



arm, tlie posterior border and part of the upper surface granular : upper 

 surface of wrist granular and costate, inner angle strongly spiniform, 

 the usual spinules on the outer angle obsolescent. Hand rather full, 

 upper surface granular, with the nsual two parallel crests and five 

 spines : the spines however are blunt and small, and the anterior two 

 of the outer row are usually obsolete: except for a few indistinct costsB 

 the other parts of the hand are smooth : the fingers are slightly longer 

 than the hand, except in the larger cheliped of the adult male. 



The merus of the last pair of legs is nearly twice as long as broad 

 and has the usual spine on its posterior border : the same border of the 

 propodite is smooth. 



The sixth abdominal tergum of the male is a good deal broader 

 than long and h is the sides parallel or slightly divergent in at least 

 two-thirds of their extent. 



A small species : the largest male in the Indian Museum has the 

 carapace 13 millim. long and a little less than 21 millim. in extreme 

 breadth, and there are several egg-laden females a good deal smaller. 



147 specimens from the Andamans (one take), besides several from 

 Mauritius. 



52. Thalamita Poissonii, Audouin et Savign. 



Portunus Poissonii, Audouin, Explic. p. 84 Savigny, Descr. Egypt. Crust, pi. ir. 

 fig. 3. 



Thalamita Poissonii, de Man, Notes Leyden Mus. II. 1880, p. 181 : Cauo, Boll. 

 Soc. Nat. Napoli, III. 1889, p. 216. 



Differs from T. chajptalii in the following particulars : — 



(1) the teeth of the antero-lateral borders are acute, and the 

 last tooth is more spiniform and more prominent than the others : 



(2) the posterior border of the propodite of the last pair of legs is 

 armed with 2 or 3 small spinules : 



(3) the teeth on the anterior border of the arm are acute. 



In the Indian Museum are two specimens from the Persian Gulf. 

 I much doubt that this is distinct from T. chaptalii. 



53. Thalamita sima, Edw. 



Thalamita sima, Milne Edwards, Hist. Nat. Crust. I. 460 : Stimpson, Proc. Ac. 

 Nat. Sci. Philad. 1858, p. 39: A. Milne Edwards, Archiv. du Mus. X. 1861, pp. 359, 

 367 ; and Nouv. Archiv. du Mus. IV. 1868, p. 70, and IX. 1873, p. 163 : Miers, Cat. 

 Crust. New Zealand, p. 28 ; and P.Z.S. 1879, pp. 20, 32; and Zool. H.M.S. Alert, pp. 

 184, 231, 518, 539; and Challenger Brachyura, p. 195: Kossmann, Eeise roth. Meer., 

 Crust, p. 50 : Tozzetti, Magenta Crust, p. 78, pi. vi. figs. 1 a-e : Hilgendorf, MB. Ak. 

 Berl. 1878, p. 800 : Tenison Woods, P.L.S. N.S. Wales, V. 1880-81, p. 118 : Haswell, 

 Cat. Austral. Crust, p. 80 : Filhol, Crust. New Zealand, Miss, ile Campbell, p. 382 : 

 Muller, Verh. Nat. Ges. Basel, VIII. 1886, p. 475 : ? de Man, Journ. Linn. Soc, 

 J. II. 11 



