263 
verse, rather more depressed behind tliaii in front. The re- 
gions are faintly defined ; the postero-lateral strongly rugose. 
The protogastric lobes are slightly prominent. The front, 
when viewed from above, appears sligiitly arcuate, rather 
more than one-third the wiacli of the carapace, marked by a 
distinct ridge or crest, the median lobe of which projects, and 
there are two lateral lobes very obscure. Slight insinuations 
mark the orbits above. Viewed from before, the front ap- 
pears nearly straight, the median portion slightly depressed. 
The antero-lateral regions are two-lobed, the lobes separated 
by a wide notch of the cervical groove ; they are faintly cris- 
tate, and the anterior one is depressed. 
The basal antennular joint is ovate and slightly ridged 
above. 
The eyes are small, scarcely projecting beyond the mar- 
gin of the carapace. 
The basal joint of the antenna is large, sub-triangular in 
shape ; its lower margin very arcuate and prominent ; a ridge 
runs nearly parallel to the inner margin, and there is a small 
tooth projecting inwards at its interior angle beneath the 
eye : its upper portion reaches the edge of the carapace, and 
both its inner and outer sides are strongly incurved. The 
third joint of the peduncle is narrower and longer than the 
second, the fourth is very short : these three joints are not 
crested or lobed. 
The appendages are more or less iridescent. 
The external maxillipeds are smooth. The internal mar- 
gin of the ischium is almost semi-circuiar. Ihe merus is sub- 
equal in length to the propodus, and there is on the inner 
side near the proximal end a prominent lobe. The carpus is 
a little shorter than the pro2:)odus : it is sub-triangular m 
shape from a side view. The joints are fringect with verv long 
hairs. The exopod does not reach to the middle of the merus. 
The chelipeds are slightly unequal — in this specimen the 
right is larger — they are long and well developed, and verv 
hairy. In the right one the merus is short, its upper surface 
irregularly rugose : there is a small incision on the upper dis- 
tal end. The carj^us is nearly smooth, rounded behind, some- 
what spindle-shaped viewed from above, nearly as long as the 
carapace; the inner and u])per margin, which is a thin, verv 
prominent ridge, bordering a deep longituauial concavitv, is 
entire and convex, and is domed with very long plumose 
hairs, which extend to parts of the upper surface : the lower 
inner margin is scarcely prominent : tliere is a small incision 
at the distal end above. The palm is a little shorter than the 
carpus, it is compressed, rounded on its upper margin, which 
is marked by a longitudinal line, and bears a few spinules 
