1895.] 
A. Alcock— Garcinological Fauna of India. 
213 
Hyastenus calvarius, n. sp. 
This species—females alone being available for comparison — differs 
from H. planasius chiefly in the following characters :— (1) there is an 
erect claw-like spine on the posterior border of the carapace in the 
middle line ; (2) the spines of the rostrum are straight, divergent, and 
about half the length of the carapace; (3) the dactyli are longer and 
slenderer. 
Three females — two of which are laden with eggs — from the 
Andamans. The larger egg-laden female measures 14 millim. from 
the tip of the rostrum to the posterior border of the carapace. 
Description of the female. 
Carapace elongate-ovate, with the surface, when denuded of 
scattered setae, smooth and polished : the gastric region is very convex : 
the only armature of the carapace is (1) a large erect claw-like spine 
near the posterior border in the middle line, (2) a small lateral epibran- 
chial spinule on either side, and (3) two or three granules along the 
antero-lateral border in the pterygostomian region. The rostrum is 
formed of two straight divergent spines, the length of which is about 
half that of the carapace proper. The antero-lateral angle of the pro¬ 
minent supra-ocular eave is sharp ; and that of the basal antennal joint 
is produced to form a spine which is plainly visible from above. 
The legs are more or less fringed with stout club-shaped hairs : 
the second pair are, as usual, the longest: the dactyli are long and 
slender, and are recurved, with the posterior margin serrate. The 
chelipeds are slender, and the fingers meet in the greater part of their 
extent. 
Hyastenus sebse, White. 
Seba, Thesaurus, III. xviii. 12. 
Hyastenus sebee, White, P. Z S., 1847, p. 57 ; and Ann. Mag. Nat. Hist., Yol. 
XX. 1847, p. 61; and ‘ Samarang ’ Crustacea, p. 11. 
Hyastenus sebse, A. Milne-Edwards, Nouv. Archiv. du Mus., VIII. 1872, p. 249. 
Hyastenus sebx, de Man, Archiv. fur Naturgesch., LIII. 1887, p. 223. 
Hyastenus sebee, Miers, ‘Challenger’ Brachyura, p. 56. 
Hyastenus sebae, Ortmann, Zool. Forsch. Austral. Malay. Archip. Jena, 1894, p. 42. 
Carapace very elongate-triangular, its surface eroded and sculp¬ 
tured, but without distinct tubercles or spines. The rostral spines, 
which are equal in length to the carapace, are paralled in their proximal 
half. The chelipeds in the male are equal in length to the carapace 
plus one-third of the rostrum : their merus is not much stouter than 
that of the next pair of legs, but the palm is broadened and somewhat 
inflated : the fingers, which are hardly more than half the length of 
