, 



Carcinological Fauna of India. 2 LI 



The chelipeds in the male are stouter than any of the other legs, 

 nd are equal in length to the carapace phis half the rostrum ; the 

 fingers, which are arched and meet in rather less than their distal half, 

 are nearly as long as the short inflated palm. In the female and young 

 male the chelipeds are rather more slender than any of the other legs, 

 and in length are equal to the post-ocular portion of the carapace ; 

 and the fingers, which are almost straight, meet in the greater part 

 of their extent. The second pair of trunk-legs are nearly twice the 

 length of the (male) chelipeds, and are far longer than any of the 

 last three pairs : the recurved and densely tomentose dactyli have the 

 posterior margin almost smooth. 



Besides specimens from the Australian and Chinese Seas, the 

 Museum possesses specimens from Ceylon, Orissa, Tavoy, and the 

 Andamans. 



Hyastenus spinosus, A. Milne- Edwards. 



Hyastenus spinosus, A. Milne-Edwards, Nouv. Archiv. du Mus., VIII. 1872, p. 250. 

 Hyastenus spinosus, Miers, 'Challenger' Brachyura, p. 56. 



This species differs from H. diacanthus only in the following parti- 

 culars : — the body and limbs are less densely tomentose ; the gastric 

 region, instead of a single acuminate tubercle, has two strong spines in 

 the middle line ; there is a stout spine, in the middle line, close to the 

 posterior border of the carapace ; the lateral epibranchial spines are 

 larger. 



These differences are constant in a large series of specimens from 

 different parts of the sea-coast of India : but in two specimens which 

 seem referable to this species the gastric region is quite smooth, though 

 abnormally convex. 



Hyastenus aries (Latr.) 



[Pisa aries, Latr. Encyc. X. p. 140]. 



Chorinus aries, Milne-Edwards, Hist. Nat. Crust. I. 315. 



Hyastenus aries, A. Milne-Edwards, Nouv. Archiv. du Mas., Till. 1872, p. 250. 



Chorinus aries, Hilgendorf, MB. Ak. Wiss. Berl. 1878, p 786. 



Chorinus aries, E. Nauck, Zeits. Wiss. Zool. XXXIV. 1880, p. 41 (gastric teeth). 



Hyastenus aries, Miers, ' Challenger ' Brachyura, p. 56. 



Very closely resembling H. spinosus, from which it differs only 

 in the following particulars — adult males of nearly equal size being 

 compared : — ( 1 ) the rostral horns, instead of being long cylindrical 

 divergent and down-curved only at tip, are short (being only one-third 

 the length of the carapace proper in the male, and only about one-fourth 

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