SEA LILIES, STARFISHES, ETC. —CLARK. 15 
significant ; nevertheless it is noteworthy that all recorded 
specimens of C. briareus and all of the thirty specimens at 
hand are blackish-brown, brownish-black, or purplish-black ; 
one recorded from Western Australia by A. H. Clark has lighter 
linesonthearm. Aside from colour, the flaring distal margins 
of the low radials and of the brachials in C. perplexum are quite 
different from those of C. briareus, while the smoothness of 
the brachials and pinnules is noticeable, as contrasted with 
the rough arms of C. briareus. I have carefully compared the 
single specimen with the descriptions of C. webert and C. rotula 
of A. H. Clark, at the kind suggestion of that well-known 
authority on the group, but the cirri show at once that it is 
not C. weberi, and the characters of the centrodorsal, the 
cirri and the brachials seem sufficient to distinguish it from 
C. rotula. The geographical isolation of this interesting 
comatulid is remarkable for no near relative has been taken 
south of Port Molle and C. briareus is not known from south 
of Port Denison, some six hundred miles to the north. 
Loc.—Eleven miles south by east of Ballina, New South 
Wales, 27-28 fathoms. 
COMANTHUS PLECTROPHORUM,! sp. nov. 
(Plate IV., fig. 1.) 
Disk about 30 mm. in diameter; arms rather more than 
100 mm. long. Centrodorsal about 10 mm. in diameter and 
more than 2 mm. thick; its bare central area is very rough, 
slightly concave and about 6 mm. across. Cirrus-sockets in 
three crowded and irregular horizontal series. Cirri LV.-LX., 
29-37, usually about 32; some proximal segments, say 4-9, 
are cylindrical and longer than thick, 5 is particularly long ; 
beyond 10 the distal dorsal margin projects slightly, the 
segments become compressed and a marked dorsal keel] is 
formed, which is most fully developed on the four or five 
segments preceding the penultimate ; seen from the dorsal 
side this is more of a tubercle than a keel, but the lateral 
aspect is very keel-like. 
Radials entirely concealed; IBr 1 wide and low, in contact 
for about three-fourths of their height ; radial axillaries, very 
low and wide, at least three times as wide as high, not at all in 
contact with each other. JIIBr series 4 (3+4), in one 
instance only, 2, well separated from each other externally ; 
internally IIBr, are more or less in contact. IIIBr series 
l. wijKTpov=a spur+Qopew=to bear, in reference to the notable 
spurs on the pinnules. 
