253 
triangular rostriform tooih is acute, quickly accuminating to 
its apex, depressed and projecting between the bases of 
the pcales of the ocular peduncles. The margin of the front 
is raisert, and the antennal projections, which do not reacli as 
far as the rostrum, are each tipped with a small tooth. A ae- 
pression behind the rostral tooth sends off an oblique brancli 
towards eacli side marking off the hepatic regions, and also a 
median longitudinal groove, which, However, is short. In the 
region of this groove the carapace is slightly rugose trans- 
versely. The hepatic regions are prominent and rounded. 
The antero-lateral portions of the carapace scarcely project 
forward as far as the tubercles of the first joints of the an- 
tennae : their descending margins carry two or three spinules. 
The cervical groove is deeply marked, and the carapace behind 
it is membranaceous, and is marked with some faint, irregu- 
lar, longitudinal lines : there is a narrow median region ex- 
panding anteriorly, and running to a depression behind. The 
branchial regions are moderately tumid. The carapace is 
sparingly hairy at the sides. 
The narrow tergum of the first abdominal segment is tri- 
angular, firm, and bears a few^ setae. The remainder of tne 
abdomen is soft, except in some sjoecimens a little leathery 
underneath : it is glabrous, except the margin of the oviferous 
sac in the female. The sixth segment is strongly calcified dor- 
sally, and is divided into two main unequal portions bv a 
deep, transverse, irregular furrow, the anterior portion thus 
divided is irregularly pitted, the posterior has a median, shal- 
low furrow, which broadens out behind. 
The ocular peduncles are long, as long as the greateit 
breadth of the anterior portion of the carapace, moderately 
robust, not expanding distally, and with a tendency to become 
slightly unequal in length. The basal scales are rather small, 
spiniform, close together, and anteriorly depressed. Ine eyes 
are rather small. 
The basal joint of the antennular peduncle is flattened 
and hollowed above, its external margin is compressed, anci 
each edge bears distally a minute spine (stylocerite). There 
is a small distal spine below also. The second and third 
joints and the thick portion of the upper flagellum are sub- 
equal in length; the lower flagellum is about half the length 
of the upper, and is naked, as is also the short distal por- 
tion of the upper flagellum. 
The first joint of the antennal peduncle has a prominent 
tubercle below, which bears the aperture of the green gland. 
The second joint is produced distally on the outer side, end'.ng 
in three converging spines, with a group of setae immediatelv 
below, the inner distal angle is less produced, and ends in a. 
