i88 
a- Centrodorsal small or of medium size, sharply conical, the cirrus sockets arranged 
in five more or less irregular columns one in the midline of each radial area ; 
cirri lonsf, from one fourth to one third of the arm lenoth 
b^ size large; cirri numerous, with numerous segments, XX — XXV, 26 — 28, 
55 mm. to 60 mm. more than one fourth of the arm length, equal to the 
distance from the axillary to the forty-si.\th brachial; arms 211 mm. long 
(Timor to the Philippine Islands; 520 — 675 Metres) robusta 
b" size small; cirri less numerous with fewer segments, X\', 18, 27 mm. long, 
about one third of the arm length, equal to the distance from the a.xillary to 
the twentieth brachial; arms 75 mm. long (Meangis Islands; 900 Metres) aciilcafa 
I. CJwndronietra rugosa nov. sp. 
Stat. 297. io°39'S., i23°4o'E. Timor Sea. 520 Metres, i Ex. 
Centrodorsal very large, truncated conical, almost columnar, 9 mm. broad at the base, 
4.5 mm. across the slightly convex dorsal pole, and 7 mm. high interradially ; the cirrus 
sockets are arranged in ten regular columns, two to each radial area; the columns in each 
radial area are almost or quite in contact which each other ; the columns of adjacent radial 
areas are separated by a narrow and irregular bare area, which may show a slight narrow 
rounded ridge in its centre; there are three cirrus sockets to a column. 
The cirri are XXX, 18 — 19, 35 mm. long, .stout and short; the first segment is very 
short, the second is about twice as broad as long, and the following gradually increase in 
leneth so that the fifth is about as long as the median or distal diameter ; the remaining 
segments are all about half again as long as the proximal diameter; the 
last five decrease rather rapidly in diameter so that the penultimate 
segment and the terminal claw are very small. After the first four 
segments the cirri become rather strongly compressed laterally; the ends 
of the segments are slightly swollen and prominent. 
The ends of the basal rays are vi-sible as small tubercles in the 
angles of the calyx; the radials are entirely concealed; the IBrj are almost 
concealed, but their distal portion, which is more or less irregular and 
tubercular, is visible as a narrow band just below the axillaries. 
The proximal brachials have the same prominent median tubercles 
as those of C. robtista^ but they are pointed instead of being rounded as 
in that species, and they lean somewhat anteriorly, so that they appear 
as broad stout overlapping spines. Instead of being perfectly smooth as 
in C. robusta, the distal borders of these earlier brachials are thickened 
and produced ; the.se thickened and produced borders after the first six 
or seven brachials bear, beside the large broad median spine (of which the base runs backward 
along the whole median line of the dorsal surface of the segment) one or two smaller and 
more pointed spines between the median spine and the lateral edge which do not involve the 
dorsal surface of the segment. 
Fig. s. 
Lateral view of the proxi- 
mal portion of a specimen 
of Chondromctra rugosa. Na- 
tural size. (Courtesy of the 
U. S. National Museum). 
