212 
A. Alcock — Carcinological Fauna of India. 
[No. 2, 
in the female), somewhat compressed horizontally, almost parallel or 
even a little incurved, and perceptibly though very slightly deflexed 
from the base ; (2) the carapace is much more convex and swollen, with 
the lateral epibrancliial and the median posterior spines much smaller; 
(3) the clielipeds have the palm less enlarged, and the fingers nearly 
straight, instead of arched; (4) the anterior angle of the supra-orbital 
eave, instead of being sharply produced, is obtuse. 
The Museum possesses specimens from the Orissa Coast and Gulf of 
Martaban, and also from the Straits of Malacca. 
Hyastenus planasius, Ad. & White. 
Pisa planasia, Adams and White, ‘ Samarang ’ Crnst., p. 9, pi. ii. figs. 4 and 5. 
Hyastenus planasius, A. Milne-Edwards, Nouv. Archiv. du Mus., VIII.-1872, 
p. 250. 
Hyastenus ( Chorilia) planasius, Miers, Zoology H. M. S. ‘ Alert,’ pp. 182 and 196 ; 
and £ Challenger ’ Brachyura, p. 57. 
Hyastenus planasius , Walker, Journ. Linn. Soc. Zool. Vol. XX. p. 109. 
Carapace elongate-ovate, its surface smooth and polished anteriorly, 
finely granulose posteriorly, and with scattered tufts of hairs : a small 
eminence in the middle of the gastric region, and a small lateral epi- 
branchial spinule, in front of which latter there may be a line of gra¬ 
nules : lateral margin with three spinules anteriorly, two of which are 
on the pterygostomian region. 
The rostrum is formed by two parallel spines, the tips of which are 
somewhat incurved, and the length of which is about one-sixth that of 
the carapace proper. The supra-ocular margin is, as usual, very pro- 
.. minent, and has its anterior angle somewhat produced. The antero- 
external angle of the basal antennal joint forms a distinct tooth visible 
from above. The legs are tomentose with additional long scattered 
setae : the second pair (1st ambulatory legs) are, as usual, markedly the 
longest, being half again as long as the carapace and rostrum : the dac- 
tyli are short, stout, recurved, and serrated posteriorly. The chelipeds 
are described by Adams and White as follows:—“small, slender, equal 
in size, covered with scattered long stout hairs ; the third joint sub- 
cylindrical, curved inwards and enlarged anteriorly ; fourth joint short, 
rounded, and curved, with two small tubercles on the outer and upper 
surface ; fifth joint rather slender, sub-cylindrical, laterally compressed ; 
claws slightly gaping in the middle, curved inwards, and finely denticu¬ 
lated.” As, however, the male specimen figured does not seem to be 
adult, these characters are perhaps changeable with age. 
In the Museum collection are a young male and female from Gan jam 
and Arrakan. 
