108 MR. F. E. BEDDARD ON ISOPODA COLLECTED [Feb. 2, 
3. ARCTURUS CORNUTUS, 0. sp. 
This species, like the last, is represented by a single female ex- 
ample, measuring 36 millim. ; the length of the antennz is 64 millim. 
The margin of the head is excavated dorsally and anteriorly ; the 
antero-lateral margin of the head below and in front of the eyes is 
notched ; between the eyes are a pair of long, forwardly-directed 
spines, and behind the eyes a pair of blunt tubercles. The first 
three thoracic segments are subequal, and each is a little longer than 
the fourth. Each of the segments is ridged as in the last species ; 
the lateral margin of the tergum has a long spine in each of their 
segments, and there is another spine of equal length placed halfway 
between the dorsal median line and the lateral margin of the seg- 
ment; on the fourth segment there is an additional lateral spine 
placed behind the principal spine; there are indications of a corre- 
sponding spine in the anterior segments. The epimera of segments 
2-4 have a single spine near to their posterior margin, the lengths of 
which increase progressively from before backwards ; in front of the 
posterior tergal ridge are a pair of blunt tubercles united by a slight 
elevation ; the first segment has also a single tubercle placed in front 
of this. Each of the three posterior segments is ridged as in A. 
anna ; laterally is a long spine which overlies a similar spine upon 
the epimeron ; the first of these segments has also a somewhat longer 
epimeral spine directed forwards. Each of the three free abdominal 
segments has along lateral spine ; the first segment has ventral spines 
as in the last species. The abdominal shield has the same shape as 
in A. anna, but there is a distinct longitudinal keel terminating in a 
sharp upturned point ; on either side is a single row of curved hook- 
like spines. The 2nd, 3rd, and 4th pairs of thoracic limbs have 
spines similar to those of the last species. 
Station 214; 500 fathoms. 
4. ARCTURUS BRUNNEUS, N. sp. 
This species measures 19 millim. in length, the antenne being of 
about the same length. The head is furnished with a pair of long 
spines between the eyes, and a pair of shorter spines behind these, 
which are, however, longer in the female. The first four thoracic 
segments are subequal, ridged as in the last two species ; on this ridge 
are implanted a number of long, straight, slender spines. In the 
male the first segment has four equidistant spines and a minute 
epimeral spine at the extreme lateral margin; on the second 
segment the epimeral spine is longer, and there is a minute tubercle 
between it and the lateral tergal spine; in the third and fourth seg- 
ments the lateral tubercle is developed into.a spine, and there is also 
a short median dorsal spine ; on the second, third, and fourth seg- 
ments there is a transverse row of longish spines near to the anterior 
margin of the segment in both sexes; in the female the spines are 
longer. Each of the three posterior thoracic segments bears a ridge, 
with a single row of long spines arranged at equidistant intervals ; 
there are three pairs of these spines, one pair epimeral; in the 
