216 A. Alcock — Oarcinological Fauna of India. [No. 2, 



the length of which in the male is about twice, in the female about once 

 and a fifth, that of the carapace. 



The post-ocular lobe is unique is form : it is very prominent, and 

 has a stout pedicle and a compressed crown, the angles of which are 

 produced. The supra-ocular eave is also unique : it also is very promi- 

 nent, and has its antero-external angle produced forwards and upwards, 

 and its postero-external angle produced backwards towards the post- 

 ocular lobe. The basal anteunal joint is deeply grooved longitudinally : 

 its antero-external angle forms a strong spine visible from above, and 

 its outer edge bears two distinct teeth which stretch towards the supra- 

 ocular and post-ocular spines respectively. All the trunk-legs are very 

 slender: the first two pairs have a strong spine on the far end of the 

 upper border of the merus, but this in the last three pairs is represent- 

 ed by a small tubercle. The chelipeds, even in the male, are slender 

 throughout, and have long slender fluted palms which are three times 

 the length of the fingers : the latter, though denticulated throughout 

 and but little arched, meet, in the male, only in their distal half. 



The first pair of ambulatory legs are, as usual, much the longest : 

 in all the dactyli are long and slender, but have the posterior edge 

 sharply serrated. 



This also is a small species, an egg-laden female of average size 

 measuring oily 17 millim., more than half of which is rostrum. 



Off Cheduba (Arakan coast) 7 fathoms : off Ceylon 30-34 fathoms. 



Dr. Henderson (Tr. Linn. Soc, Zool., 1893, p. 344) also includes 

 in the Indian Fauna, but with some doubt, the two following species : — 



1. Hyastenus convexus, Miers Zool., H. M. S. 'Alert,' p. 196, 

 pi. xviii. fig. B. (N. E. Australia ; Penang.). 



2. Hyasteuus brockii, de Man, Archiv. fur Naturgesch. LIIL, 1887, 

 p. 221, taf. vii. fig. 1. ( Amboina). 



As Dr. Henderson seems to be not quite sure of his identification, 

 and as we have no specimens in the Museum collection, I have not 

 noticed these two species at length. 



Naxta, Edw., Miers. 



Naxia, Milne- Edwards, Hist Nat. Crust. I. 313. 



Naxia, de Haan, Faun, Japon. Crust., p. 84. 



Naxia, Miers, Journ. Linn. Soc, Zool., Vol XIV. 1879, p. 658 (et synon. 

 Naxioides, A. M. Edw. and Podopisa Hilgendorf) ; and ' Challenger ' Brachyura, 

 p. 59. 



Carapace subpyriform, moderately convex, rounded behind, and 

 armed with snines or tubercles on the dorsal surface. Spines of the 



