1895.] 
A. Alcoek —Carcinological Fauna of India. 
217 
rostrum well developed, subcylindrical, parallel or divergent, and bearing 
on the inner margin, near to the extremity, a small accessory spine or 
spinule. Abdomen (in the male) distinctly seven-jointed' in the 
female some of the segments may be coalescent. Byes small, supra¬ 
ocular eave very prominent, its antero-external angle sometimes pro¬ 
duced to a spine : post-ocular lobe also very prominent, its edge un¬ 
equally bi- or tri-lobed. Antennae with the basal joint enlarged, with 
a spine or tubercle at the antero-lateral angle, and sometimes with ano¬ 
ther on the outer margin ; the flagellum either exposed, or partially con¬ 
cealed in a dorsal view by the rostral spines. Merus of the external max- 
illipeds distally truncated, with the antero-external angle little, if at all, 
produced, and the antero-internal angle emarginate. Clielipeds (in the 
male) slender and moderately developed, palm usually somewhat elon¬ 
gated, fingers denticulated near the distal extremity, and having between 
them when closed a small hiatus at the base. Ambulatory legs slender 
and somewhat elongated, the first pair much the longest, with the 
joints subcylindrical; dactyli nearly straight. 
Key to the Indian species of ISTaxia. 
I. Armature of the carapace consisting almost entirely of large 
clean-cut spines . N. hystrix. 
1. Spines of the rostrum parallel to near the 
tip : supra-ocular spine obsolete : meropodites 
of the trunk-legs without a terminal spine . N. hirta. 
II. Armature 
of the cara¬ 
pace con- 
s i s t i n g 
chiefly of 
tubercles, 
among 
which 
there are 
sometimes 
a few 
coarse 
spines. 
3. Spines of 
the rostrum 
divergent 
from the 
<{ base: supra¬ 
ocular spine 
present: 
meropo¬ 
dites of 
some of the 
trunk-1 e g s 
with a large 
t e r minal 
spine. 
i. Spines of the 
rostrum con - 
siderably 
more than 
half the 
length of the 
carapace: 
supra-ocular 
spine very-j 
large and 
acute : mero¬ 
podites of all 
the trunk- 
legs with a 
terminal 
ii. 
spine : 
long 
slender. 
palms 
and 
a. Rostral 
spines widely 
divergent: no 
large spines 
on the bran¬ 
chial or in- 
testinal 
regions . N. taurus. 
b. Rostral 
spines moder¬ 
ately diver¬ 
gent : several 
large spines 
on the bran¬ 
chial regions 
and in the 
middle line of 
the carapace 
N. cerastes . 
Spines of the rostrum con¬ 
siderably less than half the 
length of the carapace : supra¬ 
ocular spine blunt: meropodites 
of the last three pairs of trunk- 
legs unarmed : palms short and 
inflated ...... N. investigator is. 
