276 DREDGING REPORT, 1862. 
The exterior antenne (Pl. XIV., fig. 1) are very long. The 
last joint of the peduncle is large and cylindrical, and has the 
inner half girt with numerous semicircles of fine cilia (Pl. XIV., 
fig. la). The filament is of very great length and remarkably 
slender. 
The fourth pair of thoracic legs (Pl. XIV., fig. 3) are slender, 
and have the basal joint equalling half the length of the leg, 
with two or three minute cilia on the posterior border, and 
one towards the distal extremity of the anterior border. The 
second joint is very short, with a plumose cilium on each border, 
and also two long whip-cilia in front. The third joint has three 
whip-cilia in front. The fourth a minute whip-cilium in front, 
and two small spines on the posterior margin, from the distal ex- 
tremity of which there also proceed two long whip-cilia. The 
fifth joint terminates posteriorly in a long whip-cilium, and 
anteriorly in a long two jointed spine, which is the sixth joint. 
The second member or palp is as long or nearly so as the leg itself. 
The last thoracic legs (Pl. XIV., fig. 4) are slender, having their 
first joints four times as long as broad, with two plumose cilia on the 
posterior, and one on the anterior margin. The second joint, 
which is broader than long, is furnished with two whip-cilia on 
the anterior margin. ‘The third is three times as long as broad, 
with two whip-cilia in front. The fourth, fifth, and sixth joints 
closely resemble those of the preceding pair, but are more slender. 
There are three pairs of abdominal feet, which are appendages 
of the first three segments. ach of these feet, consists of a 
large oblong basal joint (Pl. XIV.,; fig. 5) and two branches. The 
inner branch consists of a single joint furnished with eight plumose 
cilia, and having on the outer margin a curious little nipple-like 
process with a slightly cleft extremity. The outer branch is two 
jointed, the last of which terminates in six long plumose cilia. 
The telson (Pl. XIV., fig. 6a) is large and produced, equalling 
in length the peduncle of the lateral caudal appendages, and is 
armed with a spine on each side, and with eight spines set round 
the extremity. The two centre and the.two outer of these spines 
are the longest, and the two centre under a high .power of the 
microscope are found to be very finely ciliate on the edges. 
