423 
The radials are short in the median line, but extend far up in the 
angles of the calyx where they form a broad process with parallel sides 
and a straight or convex distal border which entirely and widely sepa- 
rates the bases of the IBr;; in width this anterior process from the radials 
is equal to about half the length of the ventrolateral edge of the IBr,; 
the IBr, are oblong, nearly or quite three times as broad as long, with 
the ventrolateral edge produced into a thin flange-like border with a 
smooth outer edge which is about twice as wide proximally as distally, 
proximally being even with the distal edge of the radial process; the 
axillaries are broadly pentagonal, not quite twice as broad as long; the 
dorsal surface is slightly excavated so that the distal edges appear pro- 
minent; the thin produced ventrolateral border of the IBr; is continued 
on to the axillaries where, viewed ventrally, it is seen to have its sides 
parallel; viewed dorsally it disappears under the produced lateral angles 
of the axillary. . 
IIBr,; the synarthrial tubercles are small and narrow, but greatly 
produced as in Perometra diomedeae; they are proportionately smaller 
and narrower than in that species, though nearly as high. 
The IBr, sometimes bears a small rounded tubercle just anterior 
to the proximal half of the synarthrial tubercle; the axillary has a more 
or less prominent narrow rounded median carination running anteriorly 
from the base of the distal half of the synarthrial tubercle often termi- 
nating, approximately on a level with the lateral angles, in a prominent 
tubercle; these are repeated on the ossicles of the IIBr series and on 
the first two brachials. 
There are sixteen arms in the type, about 70 mm long; the brachials 
are essentially as in Neometra multicolor, but each bears a prominent 
low narrow rounded carination which ends distally in a more or less 
spinous production of the distal edge; this carination lies alternately 
on either side of the median line, this alternation being most pronounced 
in the proximal part of the arm. 
P, is 10 mm long, slender and weak, with from twenty-eight to 
thirty-three segments of which the first two are enormously enlarged and 
the remainder very small, about as long as broad; P, is long, stiff and 
spine-like, though rather slender, 13 mm to 15 mm long, with from 
eighteen to twenty-two segments; P; is 17 mm long with twenty segments 
and resembles P,, but is slightly stouter with slightly longer component 
segments of which the first two are only slightly enlarged. 
Type Locality. — »Siboga« Station No. 294. 
