206 A. Alcock —Carcinological Fauna of India. [No. 2, 
elevations. On the cardiac region, and also on the intestinal region, in 
the middle line, an acuminate eminence. 
The rostrum consists of two divergent spines, about one-thiid the 
length of the rest of the carapace. 
The eyes stand well out from beneath the pre-ocular spine, and 
are retractile against a small post-ocular tooth. 
The other appendages closely resemble those of the preceding 
species ; hut the chelipeds, in the adult male, are shorter, being only 
equal in length to the carapace and rostrum, and the fingers have their 
cutting edges crenulate instead of smooth. 
In females and in young males the chelipeds have the same re¬ 
lative proportions as in Scyramathia beauchampi. 
Male. 
Female (adult). 
Length of carapace (including rostrum)... 
17 millim. 
... 13 millim. 
Greatest breadth of carapace... 
10 „ 
... 7'5 ,, 
Length of cheliped 
18 
... 9'5 ,, 
Greatest breadth of palm 
1 „ 
12 „ 
Loc. Andaman Sea, 130-240 fathoms. 
Miers Pugettia velutina (‘Challenger’ Brachyura, p. 4J, pi. vi. 
figs. 2, 2a, 2b) should, I think, be placed in this sub-genus— Scyramathia. 
Hyastenus, White. 
Hyastenus, White, P. Z. S., 1847, p. 56. 
Hyastenus, Miers, Journ. Linn. Soc., Zool., Yol. XIY. 1879, p. 658 (et synon.) ; 
and ‘ Challenger’ Brachyura, p. 55. 
Chorilia and Lahainia, Dana, U. S. Expl. Exp. Crust. I. pp. 91 and 92. 
Carapace subpyriform, convex, either smooth or tuberculate, some¬ 
times spiny. Supra-ocular eave very prominent, usually somewhat 
acuminately produced anteriorly : post-ocular spine, or lobe, large and 
excavated. The rostrum consists of two usually long slender divergent 
spines. Eye-stalks short, retractile against the post-ocular lobe, but 
never to the complete concealment of the cornea. 
Basal antennal joint broad, its antero-external angle sometimes 
produced : the mobile portion of the antenna usually exposed to dorsal 
view. 
Merus of the external maxillipeds as broad as, or broader than, 
the ischium, expanded at the antero-external angle, and bearing the 
palp at the antero-internal angle. 
