1899.] A. Alcoek — Garcinological Fauna of India. 71 



twice as long as broad and lias the usual spine at the far end of the 

 posterior border : there are 1 or 2 spinules on the same border of the 

 propodite of this pair. 



The 6th abdominal tergum of the male is truncate-triangalar and 

 its line of separation from the preceding segments is indistinct. 



A single male specimen, with the carapace 10 millim. long and 

 12 millim. broad, from off the Ganjam coast, 35 fathoms. 



Thalamonyx, a. Milne Edwards. 



Thalamonya!, A. Milne Edwards, Nouv. Archiv. du Mas. IX, 1873, p. 168 : Miera, 

 Challenger Brachyura, p. 192. 



Resembles Charybdis (— Goniosoma) in all essential characters but 

 differs in the following particulars : — 



(1) the front proper (not including the inner supra-orbital angles) 

 is broader, being very much more than a third the greatest width of the 

 carapace, and is cut into two broad lobes, not including the inner supra- 

 orbital angles : 



(2) the antero-lateral borders are very little oblique, and are cut 

 into 5 teeth only. 



Ortmann, whom I am inclined to follow, regards it as only a sub- 

 genus of Charybdis { = Goniosoma) . de Man, on the other hand, is 

 inclined to regard it as identical with Thalamita, and there is much to 

 be said in favour of this view also. The fronto-orbital border, however, 

 is not quite so broad and the antero-lateral borders are not, therefore, 

 so nearly parallel, nor is the posterior part of the carapace so contracted 

 nor the inner supra-orbital angle so broad as in most species of 

 Thalamita. It is a form that excellently well illustrates the real gen- 

 eric unity of the two supposed genera. 



45. Thalamonyx gracilipes, A. M. Edw. 



Thalamonyx gracilipes, A. Milne Edwards, Nouv. Archiv. du Mus. IX. 1873 

 p. 169, pi. iv. fig. 3. 



Thalamonyx dame var. gracilipes, Miers, Challenger Braohynra, p. 192. 



Goniosoma {Thalamonyx) danas, Ortmann, Zool. Jahrb., S'ysfc., VII. 1893-94 

 p. 83 (part). 



Carapace more than two- thirds as long as broad with the regions 

 fairly well defined and the surface granular, some of the granules 

 forming short transvei-se lines. 



Front sublamellar and prominent, divided into two broad shallow 

 lobes of which the inner angles are a little bit pronounced. 



Antero-lateral borders little oblique and little arched, forming an 

 obtuse angle little short of a right-angle with the anterior border cut 

 into five claw-like teeth of nearly equal size. 



