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



obsolescent. In the variety savignyi the liand is not particularly full 

 or deep, and the fingers, which are as long as the hand, are not chan- 

 nelled along the inner surface. 



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

 and has the usual spine near the far end of the posterior border ; the 

 posterior border of the propodite of this pair is serrated throughout. 



The 6th abdominal tergum of the male is not much broader than 

 long, its sides are slightly but gradually convergent. 



The carapace of an average male in the Indian Museum is 15 

 millim. long and 26 millim. broad, but there is a specimen much larger 

 than this from the " South Seas." 



In the Indian Museum are 45 specimens from the Andamans, 

 Mergui, Palk Straits and Persian Gulf. 



Three varieties of this species are recognizable, but the differences 

 between them are very inconstant and are not, in my opinion, of specific 

 value : — 



(1) Thalamita adineta (Herbst). " Der Hand ist gross, auf der 

 aussern W'dlhung gehornt." 



(2) Thalamita admeta A. M. Edw. "Main portant sur la face 



externe deux cretes peu marquees et lisses." 



(3) Thalamita savignyi A. M. Edw., which differs in the following 

 particulars : — 



(a) the transverse ridges of the carapace are in sharper relief : (b) 

 the division between the 2 true frontal lobes is not always broad and 

 deep : (c) the fourth tooth of the antero-lateral borders, though smaller 

 than the others, is not rudimentary : (d) the hand is not particularly 

 full and deep, and its inner surface is sometimes granular, all the 

 granular costag of the outer surface being well-marked also : (e) the 

 fingers are straighter, are as long as the palm, and have no particular 

 channelling of the inner surface. 



55. Thalamita quadrilohataf Miers. 



Thalamita quadrilohata, Miers, Zool. H. M. S. " Alert, " pp. 518, 539, pi. xlviii. 

 fig. B ; and Challenger Brachyura, p. 194. 



Differs from T. admeta in the following particulars : — 



(1) the carapace is not quite so broad, its length being about three- 

 fifths its breadth : 



(2) the two lobes that form the front proper project very much 

 more beyond the two lobes that form the supra-orbital angles and their 

 free edges are so concave and their angles therefore are so pronounced 

 that the front (not including the supra-orbital angles) appears four, 

 lobed : 



