1898-1902. No. 18.] CRUSTACEA. 33 
ones combined and evenly rounded in front, rostral projection very 
slight, almost obsolete. Urosome nearly as long as the anterior 
division, segments finely spinulose at the hind edge ventrally and late- 
rally, last segment almost as long as the preceding one, but somewhat 
narrower, anal opercle perfectly smooth. Caudal rami comparatively 
short and obliquely oval in form, with the outer edge very convex, 
almost angular in the middle, the inner nearly straight, tip obtusely 
rounded, dorsal face with a slight carina running along the proximal 
part as far as the small dorsal seta, and followed by a row of 4 rather 
strong denticles extending to the inner corner; outermost apical seta 
attached at some distance from the other three, apparently to the 
outer edge, seta of this edge attached considerably in front of the 
middle; outer medial seta somewhat bent outwards at the base, and 
about half as long as the inner, which about equals in length the uro- 
some and last pedigerous segment combined. Anterior antenne rather 
slender, though not attaining the length of the cephalic segment, 8-arti- 
culate, and only sparingly setiferous, terminal part about the length of 
the proximal one. Posterior antenne and oral parts exhibiting the 
structure characteristic of the genus. ist pair of legs moderately slender, 
outer ramus a little longer than the Ist joint of the inner, its last joint 
exceeding in length the middle one, and carrying on the tip 2 slender 
spines and 2 geniculate sete; inner ramus with the 1st joint a little 
longer than the outer 2 combined, and having inside, at a short distance 
from the end, a comparatively short seta, last joint more than twice as 
long as the preceding one, sub-linear in form, and carrying on the tip 
a slender claw and a long seta. Natatory legs with the rami less 
slender than in the type species, but otherwise of a very similar struc- 
ture. Last pair of legs with the distal joint comparatively small, oval 
in form, and armed with 5 marginal sete, one of which, issuing from 
the tip, is very thin, hair-like, the others rather coarse and spinulose at 
the edges; inner expansion of proximal joint rather large, lamellar, ex- 
tending almost as far as the distal joint, and broadly rounded at the end, 
which carries 6 coarse spinulose sete of somewhat unequal length. 
Male with the anterior antennz hinged in the usual manner. Inner 
ramus of 2nd pair of legs with the 2 outer joints wholly coalesced; that 
of 3rd pair very conspicuously transformed, 3-articulate, 1st joint short, 
projecting outside in an acute corner and carrying inside a small bristle; 
2nd joint likewise short, but produced inside to a long deflexed process 
terminating in a thin setiform point; last joint oblong fusiform in shape, 
and carrying on the tip 2 slender sete of unequal length. oe pair of 
