290 
A. Alcock — Carcinological Fauna of India. 
[No. 2, 
visible from above, on the ventral aspect of the antero-external angle, 
as well as a much smaller spinule on the dorsal aspect. There is also a 
spinule, in the middle line, on the gastric region, and one on the cardiac 
region, as well as one near the middle of either branchial region. 
The rostrum consists of two slender acute spines, which are about 
one-fourth the length of the carapace proper, and are in the closest 
contact up to the very tips. 
The eyes are movable forwards but are quite non-retractile back¬ 
wards, and are in great part concealed beneath a large laminar 
supra-ocular spine, which has its anterior angle produced forwards and 
its posterior angle produced outwards. No post-ocular spine. 
[The spinule on the ventral surface of the hepatic angle is in no 
sense a post-ocular spine.] 
The basal antennal joint is broad and has its outer edge irregu¬ 
larly wavy, somewhat as in Dana’s figure of Oregonia gracilis (U. S. 
Expl. Exp., Crust., I. pi. iii, fig. 2b.) ; it sharp antero-external angle 
is, like the following joints and the flagellum, plainly visible, from 
above, beside the rostrum: the mobile portion of the antenna is rather 
more than half the length of the carapace and rostrum. 
The chelipeds in the female are not stouter than the other legs, 
and are shorter than the carapace and rostrum : their palm is nearly 
twice the length of the fingers, which meet only at the tip. 
The ambulatory legs all have slender joints and a strongly recurved 
prehensile dactylus : the first pair, which are the longest, are, in the 
female, a little longer than the carapace and rostrum. 
A single egg-laden female has the following dimensions :— 
Length of carapace and rostrum 
Greatest breadth of carapace 
Length of chelipeds 
Length of first ambulatory legs 
... 6'2-f 2 = 8*2 millim. 
Foe. Karachi. 
The place of the above genus in the “ Key to the Indian genera of 
the sub-family Acanthonychinas ” (pp. 190 and 191 ante), is with Huenia 
and Mensethius , from both of which it is easily diagnosed (1) by the 
Pisa- like rostrum, consisting of two sharp slender spines in the closest 
contact throughout their extent, and (2) by the large antennary flagel¬ 
lum and by the eroded outer edge of the basal antennal joint. It has, 
indeed, the closest natural relations with Mensethius. 
The unique specimen has only just been received along with the 
“ Investigator ” collections of the season 1894-95. 
