Erythrometra A. H. Clark. 

 Key to the Species of the Genus Erythrometra. 



a 1 Cirri with 36 — 39 segments, iS mm. long; arms 60 mm. long (Moluccas; 



236 Metres) australis 



a 3 Cirri with 30 segments, 11 mm. long; arms 35 mm. long (s o u t h e r n Japan; 



99 — 270 Met r es) ruber 



1 . Erythrometra australis sp. nov. 



"Albatross" Stat. 5617. Dodinga Bay, Gilolo. 236 Metres. 1 Ex. 



The centrodorsal is hemispherical, the small bare dorsal pole covered with closely set 

 rounded tubercles. 



The cirri are about XXX, the long peripheral 18 mm. long with 36 — -39 segments, the 

 short apical 4 mm. long with about 15 segments. In the long peripheral cirri the first two 

 segments are more than twice as broad as long, the third is slightly broader than long, the 

 fourth is from one third to one half again as long as broad, the fourth and fifth are about 

 twice as long as broad, and the following gradually decrease in length to the fourteenth which 

 is about as long as broad, and still further to the last dozen or so, which are about twice 

 as broad as long; the longer earlier segments are rather strongly constricted centrallv, with 

 prominent ends ; the distal dorsal border of the proximal segments is prominent ; as the segments 

 become shorter they gradually develop a prominent median carination the crest of which is 

 convex in lateral view. 



The radials extend slightly beyoncl the rim of the centrodorsal ; their distal border is 

 abruptly everted, smooth or more or less tubercular. 



The IBrj are approximately oblong, between three and four times as broad as long, 

 the proximal and distal edges prominently everted, the lateral eclges bearing from four to six 

 long blunt tubercles. 



The IBr 2 (axillaries) are rhombic, not quite twice as broad as long, the proximal and 

 distal edges everted, and the lateral angles produced into a ventrolateral process, or bearing 

 two long blunt tubercles resembling those on the lateral borders of the IBr r Usually the sides 

 of the IBrj diverge at an angle of about 6o°, and the lateral angles of the axillaries nearly 

 or quite meet above the gap thus formed. 



The arms are about 60 mm. long. 



The first brachials are short, twice as long exteriorly as interiorly, the median length 

 approximately the same as the inner ;,the inner edges are in apposition, and the outer bear a 

 rather broad thin ventrolateral process, and at the distal angle a tubercle; the proximal, and 

 outer half of the distal, edges are thickened and everted. 



The second brachials are irregularly quadrate, twice as broad as long, with the proximal 

 border slightly everted ; the proximal inner and outer angles usually bear a tubercle. 



The first syzygial pair (composed of the third and fourth brachials) is slightly longer 



