■36 
centrodorsal of the specimen shown in fig. 6 on pi. 32 of the "Challenger" report; it is almost 
entirely covered by about forty closely crowded cirrus sockets; the small bare polar area has 
a few long tubercles. 
The cirri are about XL, 21 — 22, about 10 mm. in Icn^tii; the first segment is short, 
the second nearly or quite as long as the diameter of the expanded distal end, the third half 
again as long as the diameter of the. expaiuled distal end, the fourth and fifth the longest, 
twice as long as the diameter of the expanded distal ends; the following gradually decrease 
in length so that tlic last four or f:ve are only very slightly longer than broad; the longer 
earlier segments have broadly expanded overlapping distal ends, this character becoming less 
and less pronounced distally, and absolete on the terminal segments where there is only a slight 
ventrolateral overlap ; the short distal segments develop a slightly carinate dorsal spine. 
The radials are very short in the median line, but extend well up in the angles of the 
calyx so that the ba.ses of the IBr, are not in apposition. 
The IBr, are very short, about five times as broad as long in the median line, slightly 
longer laterally than centrally ; the lateral borders are parallel ; the distal edges, e.xcept in the 
median line, are everted and finely spinous; the proximal border is slightly everted; there is 
a tuft of spines on the distal angles. 
The IBr^ (a.xillaries) are almost triangular, slightly broader than long; the distal edges 
are slightly everted and very finely spinous ; the lateral angles are covered with spines. 
The IBr series and lower brachials are in lateral contact e.xcejjt for small "-J-' shaped 
water pores. 
The arms are about 30 mm. long; the brachials have only very slightly produced and 
very finely spinous distal ends. The distal intersyzygial interval is two oblique muscular articulations. 
The specimen of '^ Antedon alternata" represented in fig. 6 of pi. 32 of the "Challenger" 
report, which was dredged north of New Guinea in 1926 Metres, certainly belongs to the genus 
Nepiometra^ and very possibly to this species. 
5. Nepionietra parvula tHartlaub). 
Hartlaui;. Bull. Mus. Comp. Zool., vol. 27, 1895, N" 4, p. 144, pi. 3, fig. 21 {Antcdon parvula). 
Phrixometra A. 11. Clark. 
The only species in the genus Phrixometra is 
I. Phrixometra lofigipitma (P. H. Carpenter). 
P. H. Carpenter. -Challenger" Reports. Comatulae, i8S8, p. 185, pi. 30, figs. 1—3 (Anudoii 
longipinna). 
Bathymetra A. H. Clark. 
Key to the Species of the Genus Bathymetra. 
a' Centrodorsal low, subconical, about half as high as broad, the cirrus sockets 
