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the posterior border. The posterior margin is short, slightly 
raised, and granulate, with a small transverse ridge, usually 
bearing three distinct granules close above it. 
The front is almost vertically depressed, narrowing, and 
produced well beyond the orbits, terminating in a small ros- 
tral process, which projects downwards between the anten- 
nules. 
The orbits are nearly circular, the internal sub-orbital 
angle slightly accentuated. 
The basal antennal joint is slightly oblique, becoming 
narrower distally, barely reaching the sub-orbital angle : the 
second joint is much smaller, and just reaches the contiguous 
part of the front ; the third joint and flagellum are very small 
and lie in the orbital cavity. 
The epistome is sunken, but strongly bordered all around. 
The sub-orbital region is rather tumid : an excavation be- 
hind divides it from the sub-hepatic lobe, and joins a large 
cavity, separating the sub-hepatic from the pterygostomial 
region. 
The external maxillipeds completely close the buccal 
cavity. The ischium is about twice as long as the merus ; its 
internal distal angle is slightly produced above the trans- 
verse line; it has a longitudinal groove, and strongly granu- 
late ridge. The merus is sub-quadrate, its external distal angle 
slightly overlapping the end of the exopod, its inner distal 
angle truncated, the space filled by the succeeding joint. The 
exopod has a longitudinal series of strong granules. 
The chelipeds are moderately robust, the merus is 
thicker proximally, sub-cylindrical, very rough above, with a 
conical, erect process near the proximal end ; anteriorly there 
are two or three triangular processes, also proximal : the 
lower surface is more evenly granulate, and has two small pro- 
jections about the middle; there are also one or two projec- 
tions posteriorly. The carpus is somewhat flattened above. 
The hand is trigonous, its upper surface flattened and ascend- 
ing to the base of the mobile finger, where it is very promi- 
nent and jagged. The inner margin bears three compressed 
processes projecting inwards, the middle one of which is much 
larger. The lower margin bears a series of five or six forward- 
projecting, compressed processes, usually acute, extending on 
to the immobile finger. The outer surface is slightly convex, 
and bears an obscure tubercle or two about the middle. The 
fingers are as rough as the hand, very much compressed later- 
ally, the apices are crossed, and when in this position the op- 
posable edges meet. 
The ambulatory legs are small, covered with more or less 
spiniform points ; the first pair does not reach as far as the 
