108 MR. F. E. BEDDARD ON ISOPODA COLLECTED [Feb. 2, 



3. ArCTURUS CORNtlTUS, D. Sp. 



This species, like the last, is represented by a single female ex- 

 ample, measuring 3(i millini. ; the length of the antennae 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 suhequal, 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 eacli 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 backwaids ; 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 |)laced in front 

 of this. Each of the three posterior segments is ridged as in A. 

 anna ; laterally is a long spine which overhes a similar spine upon 

 the epimeron ; the first of these segments has also a somewhat longer 

 epimeral spine directed forwards. Each of tlie 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. Arcturtjs brunneus, n. sp. 



This species measures 19 millim. in length, the antennse being of 

 about the same length. The head is furnished with a pair of long 

 spines between the eyes, and a pair of shorter S])ines behind these, 

 which are, however, longer in the female. The first four thoracic 

 segments are suhequal, 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 s|)ines 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 tlie 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 



