GREGARIOUS CRUSTACEA FROM CEYLON. 
3 
BARUNA , n.g. 
Carapace broader than long, flattened, with short transverse 
median groove, front slightly depressed, antero-lateral margins 
tridentate. Third maxillipeds completely opercular, exopod 
broad but narrower than the third joint, which itself is narrower 
and shorter than the fourth, the connection between the two 
being angular between points at the same level ; the fifth joint, 
implanted at the middle of the somewhat irregular apical margin 
of thejdistally widened fourth joint, is also distally widened, and 
carries feathered setae on its outer border ; enormously long 
feathered setae proceed from the inner surface of the fourth 
and from the apices of the three following joints. Chelipeds of: 
the male subequal, very large, with a gap between the closed 
fingers, the other legs hirsute on the back, the last pair the shortest. 
Pleon of seven segments in both sexes, in the female broad with 
densely hirsute margins, in the male with the last segment longest, 
subparallel-sided. 
This genus appears to approach Varuna and Pseudograpsus, 
established by Milne-Edwards, and Stimpson’s Platygrapsus , 
but in Varuna the third maxillipeds have the fourth joint smaller 
than the third, in Pseudograpsus (at least as defined by Miers) 
they have the exopod as broad or nearly as broad as the third 
joint, and in Platygrapsus the third joint meets the fourth in a 
singularly oblique line of junction. The definition of Pseudo¬ 
grapsus given by Milne-Edwards in 1837 would include the 
species about to be described, but it is evidently quite distinct 
from either P. penicilliger (Latreille) or P. pallipes , Milne- 
Edwards, the only two species referred to Pseudograpsus at its 
institution. 
BARUNA SOGIALIS , n. sp. 
Pl. 1a. 
The carapace is punctate, apparently a little depressed trans¬ 
versely behind the front and at this part furry, some long hairs 
being distributed over other parts of the back. The front is a 
third of the extreme breadth. The antero-lateral margins are 
shorter than the postero-lateral, and are divided into three lobes, 
that nearest the orbit being the largest and subdivided into six or 
seven small teeth, the next into three or four, while the last 
is simple, rather a blunt tooth than a lobe. Both sexes have seven 
distinct segments in the pleon, which in the male narrows rather 
abruptly at the fifth segment, and has the last segment the longest, 
apically rounded. The pleon in the female is very broad, especially 
