1895.] 
A. Alcock— Carcinological Fauna of India. 
211 
The chelipeds in the male are stouter than any of the other legs, 
and are equal in length to the carapace plus 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 differ 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.) 
[Ptsa aries, Latr. Encyc. X. p. 140]. 
Chorinus aries, Milne-Edwards, Hist. Nat. Crust. I. 315. 
Hyastenus aries, A. Milne-Edwards, Nouv. Archiv. du Mus., VIII. 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 
J. ii. 27 
