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antennai spine, and two others further back: the crest is in- 
terrupted by a notcli at the anterior end of the cervical 
groove, and on a slight lobe behind the notch are sometimes 
found two other small spines. The posterior border is raised 
and insinuate. 
The pleon is smooth, ))olished, and glabrous, except on 
the margins. 
The liuea (inoin iinra reacnes from beneath the antennai 
peduncle to the edge of the lateral wall of the carapace, just 
above tlie coxa of the third pair of legs, a. short, oblique ricige 
immediately beliind the marginal notch before mentioned 
reaches from the anterolateral crest across to this suture. 
The eyes are small, and scarcely projecting. 
The first joint of the antennular peduncle has two oblique 
ridges, which converge and unite inwardly. 
The basal joint of the peduncle of the antenna 
is somewhat triangular ; it forms the external mar- 
gin of the orbit : its upper portion reaches 
the margin of the carapace, its lower border bears 
three or four teeth towards the inner end, the innermost one 
of which is below the eye, is spiniform, and directed for- 
wards, and is visible from above : the other three teeth are 
small, and point inward. The third joint is a little longer 
than the second, expanding towards the distal end, where 
there is an anterior projection ; the fourth joint is small, and 
also has a slight projection. The flagellum is long. 
Ill the external maxillipeds the ischium is moderately 
broad, sub-triangular, produced a little, and broadly rounded 
at the inner distal angle, its outer distal angle having a 
strong, obtuse tooth, which usually lies in a shallow groove of 
the exopod. The outer surface is slightly excavate, and the 
external margin thickened and defined by two ridges. The 
merus has the inner lobe marked with six or seven denticles. 
The carpus also has an internal lobe, with a strong tooth be- 
low, and a longitudinal lateral ridge, and its upper distal end 
terminates in an acute tooth. The joints are fringed with 
the long hairs, as is usual. The exopod is slightly curved, 
and tapers to an obtuse point. It reaches to more than half 
the length of the merus : its outer face is slightly excavate. 
The chelipeds are usually equal in the female ; they are 
rough, like the carapace. The merus is short, and bears a 
large anterior lobe, whch is acute, with very small denticles 
on its edge ; there is a small spine on the distal margin under- 
neath. The carjDUs, which is about as long as the palm, is 
slightly excavate longitudinally on the inner surface : the 
upper surface has two longitudinal sulcations, with a promi- 
nent ridge between them marked by rblique striae : the outer 
