218 
. [No. 2, 
A. Alcock —Carcinological Fauna of India . 
Naxia investigatoris, n. sp. PI. IV. fig. 3. 
Distinguished from all other Indian species by the form of the 
male chelipeds, of which the palm, instead of being long and slender, is 
short and broadly inflated. 
Carapace subpyriform, with all the regions well-defined, and the 
whole surface, from the base of the rostral spines, sharply tubercular. 
The rostral spines in the male and sometimes in the female are 
hardly one-third the length of the carapace proper, and are divergent, 
with the accessory spine in the middle of the distal half: often, but not 
always, in the female they are less than one-fourth the length of the 
carapace, are little divergent, and bear the accessory spinule near the 
tip. The antero-external angle of the prominent supra-ocular eave is 
surmounted by a blunt spine : the basal antennal joint has a similar 
spine at its antero-external angle, and another near the middle of its 
outer border. 
The chelipeds are granular, and their meropodite has a small 
spinule at the distal end of its upper border: in the male they are a 
little longer than the carapace, the palm is short—less than twice the 
length of the fingers—inflated, and enlarged from behind forwards, and 
the fingers are strongly arched and meet only at the tip: in the female 
they are only as long as the post-rostral portion of the carapace, are 
slender throughout, and have nearly straight fingers. The 2nd pair 
of trunk-legs (1st pair of ambulatory legs) are 2^ times the length of 
the carapace, and have the meropodite armed with a strong spine at the 
distal end of its upper border, and the dactylus of remarkable length, 
nearly equal to the propodite : the other legs are much shorter, and 
have the spine replaced by a small tubercle, their dactylus being of 
ordinary length. 
Colours in spirit, pale ochre. 
Loo. Andamans; and off Ceylon, 34 fathoms. 
Length of carapace and rostrum 
Greatest breadth of carapace 
Length of chelipeds ... 
Length of 2nd pair of legs... 
Male. 
Ovigerous 
Female. 
19 
millim. 
17 millim. 
10-5 
10 „ 
23 
>> 
14 
41 
36 „ 
Naxia hirta , A. Milne-Edwards. 
Naxioides hirta, A. Milne-Edwards, Ann. Soc. Ert. Fr. (4) V. 1865, p. 143, 
pi. iv. fig. 1. 
Podopisa petersii, Hilgendorf, MB. Ak. Berl., 1878, p. 785, taf. i. figs. 1-5. 
Naxia petersii, Miers, Zoology of H. M. S. ‘ Alert,’ p. 523. 
