214 
A. Alcock— Garcinological Fauna of India. 
[No. 2, 
the palm, are arched, and meet only at the tip. The other legs are 
slender, the second pair being much longer than the last three pairs 
and longer than the chelipeds. 
The Museum possesses a specimen from Mauritius, which I have 
included here for the sake of comparison. 
Hyastenus oryx , A. Milne-Edwards. 
Hyastenus oryx, A. Milne-Edwards, Nouv. Archiv. dn Mus., VIII. 1872, p. 250, 
pi. xiv. fig. 1. 
Hyastenus oryx, Haswell, Proc. Linn. Soc., N S. Wales, Vol. IV. 1879, p. 442 ; 
and Cat Austral. Crust., p 20. 
Hyastenus ( Chorilia ) oryx, Miers, Zool. H. M. S. ‘Alert,’ pp. 182 and 195, 517 
and 522 ; and ‘ Challenger ’ Brachyura, p. 58. 
Hyastenus oryx, de Man, Archiv. fur Naturgesch., LIII. 1887, p. 224, taf. vii. 
fig. 2. 
Hy astenus oryx, C. W. S. Aurivillius, Kongl. Sv. Vet. Akad. Handl. XXIII. 
1888-89, No. 4, p. 50, pi. iv. fig. 4. 
Hyastenus oryx, A. O. Walker, Journ. Linn. Soc., Zool., Vol. XX. 1890, p. 109. 
Carapace pyriform, little setose, crisply and rather closely tuber- 
culated, but without any spines, the tubercles on the gnstric region 
beino 1 disposed in the form of a cross or anchor. The rostrum consists 
of two slender horns, which in the male are about half the length of 
the carapace proper, and strongly resemble the horns of an Oryx in 
miniature: in the female they are not one-third the length of the 
carapace, and are nearly parallel. 
The supra-ocular eave is sharply angled, but not produced, an¬ 
teriorly. The basal antennal joint is sharply toothed at the antero- 
external angle. 
The chelipeds in the male are as long as the carapace plus two- 
thirds of the rostrum their merus is slender, but the palms are 
broadened and inflated ; and the fingers, which are from half to two- 
thirds the length of the palm, are arched, aud meet only at the lip. 
In the female the chelipeds are considerably shorter than the post¬ 
ocular portion of the carapace, and are rather more slender than the 
ambulatory legs, the fingers being but little arched, and little separated 
when clenched. 
The ambulatory legs are slender, with slender almost smooth 
actyli: the first pair, which are considerably the longest, are about 
one-fourth longer than the carapace and rostrum. 
This, like Hyastenus calvarius , is a small species, an egg-laden 
female of average size measuring only 14 millim. from the tip of the 
trum to the posterior border of the carapace. It is a common species 
at the Andamans, and has also been taken ofl^Oeylon at 34 fathoms, 
