14 ‘* ENDEAVOUR” SCIENTIFIC RESULTS. 
xenus CoMANTHUS, A. H. Clark. 
COMANTHUS PERPLEXUM,! sp. nov. 
(Plate sine fie: 25) 
Centrodorsal well developed, nearly 5 mm. in diameter, 
slightly concave ; around its margin is a series of about 15 
cirrus-sockets, 7 or 8 of which bear more or less developed 
cirri; the largest of these are about 13 mm. long and consist 
of 16-19 segments, of which the terminal 3 or 4, aside from 
the claw, carry very insignificant elevations or ridges on the 
proximal dorsal margin. IBr series, 3, all visible, the 
axillaries broadly triangular, not in contact interradially. 
I[Br 4 (3+4), low, broad, smooth and practically without 
articular tubercles; distal margins distinct, slightly flaring, 
especially on IIBry; the whole series is only 5 mm. long 
and is nearly 4 mm. wide. IIIBr series 2, except on one 
IIBr series, where one arm has a IIIBr series 4 (3-++4) and 
the other arm is undivided. There are 4 IVBr series present, 
all 4 (8+4) and there are thus 44 arms; these are about 
100 mm. long and have approximately 100 segments beyond 
the last division; there is a syzygy between 3 and 4, and a 
second ten to fifteen segments beyond ; after that the syzygial 
interval is 5, with remarkable uniformity. Brachials quadri- 
lateral but except near tip of arm, the pinnular side is much 
wider than the one opposite ; distal margins flaring, thickened 
and minutely rough but not spinulose. Pinnules rather 
slender; P; about 17 mm. long, with 45 segments, of which 
only the terminal 10 form the comb ; Pz, shorter with about 35 
segments, 10 in the comb; P3 remarkably short and weak, 
scarcely 5 mm. long and consisting of only 18-20 segments, 
the terminal comb of 7 segments is well-marked ; none of the 
subsequent pinnules have a comb, but they gradually increase 
in length to 10 mm. or more, still consisting, however, of about 
20 segments ; none of the segments are conspicuously spinu- 
lose, though the terminal ones are more or less so, but the 
basal segments are notably triangular. Disk wanting. 
Colour (dry), uniformly pale fawn ; oral surface of arms and 
pinnules brownish-black. 
There is no doubt that this species is very near C. briareus 
(Bell), but after comparison with numerous specimens, I am 
unwilling to refer it to that species. The colour is naturally 
the most striking difference, but, of course, is the least 
1. Perplexus=puzzling, in reference to the doubt whether it is really a 
distinct species. 
