210 Rev. T. R. R. Stebbing on 
following pairs, but they are not acuminate. The large third 
segment of the pleon has its postero-lateral angles rounded ; 
the sixth segment is scarcely visible dorsally. 
The eyes are small and dark. 
First Antenne.—The first joint is rather longer and much 
stouter than the second ; the third is rather more than a third 
of the first in length. ‘The flagellum consists of about fifteen 
joints, of which the last is minute, the rest moderately long. 
The secondary flagellum is very narrow, two-jointed, not 
equal to the first of the primary, with the terminal joint 
minute. On one antenna of a female specimen this ap- 
pendage consisted of three joints, of which the first was 
shorter than the second, the whole appendage equalling in 
length the first joint of the principal flagellum. The ap- 
pendage of the companion antenna was normal. 
Second Antenne.—The third joint is equal in length and 
depth, having a winged appearance on the lower side. The 
fourth joint is much narrower, but more than two and a half 
times as long. The fifth joint is shorter and much narrower 
than the fourth, but longer than the three- to four-jointed 
flagellum. The lower antenne, though with a much longer 
peduncle, are, on the whole, considerably shorter than the 
upper. 
The mouth-organs offer no specially distinguishing features. 
First Gnathopod.—In the male the second joint is mode- 
rately broad, carrying but few sete; the fourth joint has a 
very acute apex; the fifth is of great length and breadth, 
much broader than the second, which it partially receives in 
a channelling of its fiont margin ; its hind margin is serru- 
late and setiferous. On its straight distal border is seated 
the much narrower hand, which has several small groups of 
setes on each margin and some on the inner surface. The 
palm is formed by a strong tooth near the hinge of the finger 
and a very small tooth at the other extremity, between them 
being a tooth of intermediate size, separated from the largest 
tooth by a broad denticulate cavity. The finger, with serrate 
inner margin, exactly reaches the small tooth of the palm, 
below which is inserted a stout spine. In the female the 
wiist 1s not much broader than the second joint or the hand. 
It is densely setose on the hind margin. ‘Lhe hand is abun- 
dantly setose on both margins ; its palm is not dentate and is 
overlapped by the serrate finger. The second joint has several 
sete projecting from the front border; there is a group on 
the apex of the third and several groups on the fourth joint. 
Second Gnathopod.—In the male the second, third, and fourth 
joimts are nearly as in the first pair, but on a smaller scale ; 
