80 A. Alcook — Garcinological Fauna of India. [No. I, 



Differs from T. prymna in the following slight particulars : — 



(1) the baaal antenna-joint has a row of granules, but no spines : 



(2) the inner supra-orbital angles are broader : 



(3) the 4th spine of the antero-lateral border is usually not so 

 complete a rudiment. 



In the Indian Museum is one specimen from the Andamans (besides 

 others from Singapore, Hongkong and Australia.) 



This, as Miers has remarked, is one of the forms that supports 

 Kossmann's view as to the identity of all the preceding species of 

 Thalamita. 



51. Thalamita Chaptalii, Aud. et Savign. 



Portunus Chaptalii Audouin, Explic. p. 83 Savigny Descr. Egypte Crnst. pi. iv. 



fig.l. 



Thalamita chaptalii, Milne Edwards, Hist. Nat. Crust. I. 460: A. Milne Edwards, 

 Archiv. du Mus. X. 1861, pp. 360, 367 : Miers, Zool. H. M. S. Alert, p. 231 (foot- 

 note; : Cano, Boll. Soc. Nat. Napol. III. 1889, p. 216. 



? Thalamita sima, Henderson, Trans. Linn. Soc, Zool., (2) V. 1893, p. 373. 



Carapace two-thirds as long as broad, pilose, considerably convex, 

 the transverse ridges distinct and disposed as in the preceding species 

 except that there is an additional one running across the cardiac region 

 and on to the branchial region on either side, its endings on the bran- 

 chial regions being the most distinct part of its course. 



Front proper forming a broad shallow arch grooved but not deeply 

 divided in the middle line : the inner supra-orbifcal angles, which have 

 their anterior border curved, are very much less wide than the frontal 

 lobes proper. 



Antero-lateral borders cut into five teeth, of which the fourth, 

 though considerably smaller, and the fifth, though somewhat smaller 

 than the other three, are quite well developed : the first three teeth are 

 somewhat square-cut, the first being very distinctly so. . 



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

 forms a curve with the postero-lateral borders, its length is slightly 

 more than a third the greatest breadth of the carapace. 



Orbits without any particular dorsal inclination, their major 

 diameter about one-fourth the width of the interorbital space : the 

 inner angle of the lower border is not pronounced. 



The basal antenna-joint is between a fifth and a sixth the greatest 

 breadth of the carapace in extent, and is traversed by a low smooth 

 crest. 



Chelipeds about 2^ times the length of the carapace : usually only 

 two enlarged teeth — and those blunt— on the anterior border of the 



