524 Capt. A. F. McArdle on 
of the carapace, the distal half inclined downwards. It is 
uniformly curved, with tubercles smaller than those on the 
carapace. There are no spines on the abdominal terga; those 
of the second, third, and fourth somites are deeply grooved 
transversely, the fifth and sixth partly covered with long 
hair. The basal joint of the antennulary peduncle is large 
and inflated, and both the external spines are large and 
distinct. The antennary peduncle is small with a short 
external spine, the flagellum a little longer than carapace and 
rostrum combined. The eye-stalks have almost disappeared 
and are fused at the base, and produced into a small spine 
above the lateral almost immovable eyes. 
The external maxillipeds, small and slender, have the 
ventral borders of the merus obscurely serrated. The cheli- 
peds are about as long as the body and carapace without the 
rostrum, and one and a half times as long as the second pair 
of legs. All the joints are coarsely granular, and the merus 
to the fingers covered with long hair. The ventral border of 
the ischium is produced and carries a spine, and the distal 
ends of the merus and carpus are spinose. 
The second, third, and fourth legs tuberculate, with spines 
on the distal ends of their meropodites and on the anterior 
borders of carpus and propodites ; they are more distinct on 
the second and third than on the fourth pair of legs. 
No epipodites on either chelipeds or legs. 
Colour in spirit ivory-white. 
A single specimen, male, dredged at Sta. 274 in the 
Arabian Sea, from 1150 fath. 
Distinguished from EHlasmonotus longimanus (A. M.-E.), 
which it most nearly resembles, by the different shape of the 
rostrum, the length of the chelipeds, the spine on the orbital 
peduncle, the long flagellum, and the antennary peduncle 
reaching well in advance of the almost immovable eyes. 
Munidopsis (Elasmonotus) Sinclairi, sp. n. 
Carapace unarmed, quadrangular, a little longer than 
broad, and broader anteriorly than posteriorly. Lateral 
borders parallel, subcristiform, and ending anteriorly in 
rounded angles. Regions well marked, and the gastric area 
considerably elevated. Rostrum simple, acutely triangular, 
nearly half the length of the remainder of the carapace, and 
with its distal end inclined upwards. The second, third, 
and fourth abdominal terga are non-spinose, but deeply 
grooved and carinated transversely; the fifth and sixth smooth, 
the tergum of the fifth slightly elevated. ‘The base of the 
antennulary peduncle carries two large external spines, and 
