length and becoming ne'arly, sometimes quite, as loog as Ito. ui on the fifth; the next two 

 three are similar; the following verj gradually decrease in length so that those in the outer 

 fourth of the cirri are about twice as broad as long; in their outer fourth of fifth the cirri 

 taper very gradually so that the tip is comparatively slender. The distal edges ol the segments 

 all around are everted and prominently overlapping. From the tenth segment onward there 

 is evident a carination of the mid-dorsal line, at first affecting only the (listal part of the 

 lents but soon rising into a high sharp keel occupying the entire length of the dorsal 

 surface, the crest of which is parallel to the long axis of the cirri. In the 'listal portion of the 

 cirri. beginning on the tenth-eighteenth (usually on the fourteenth or fifteenth) segment before 

 the terminal claw a small tubercle appears on either side of the median carination near the 

 lateral borders of the segmtfnts as viewed dorsally; these tubercles rapidly elongate and develop 

 into supplementary keels parallel to the median keel and similar to it, but lovver. 



The radials are even with the edge of the centrodorsal in the median line, but are 

 strongly produced in the angles of the calyx where they separate widely the bases of the IBr, ; 

 the ventral edge of this anterior process, which is straight and not spatulate nor otherwise 

 modilied, is equal in length to the lateral edges of the IBr,; the cirrus sockets are more or 

 less supported by the radials as in Oreometra mariae. 



The arms are from 30 to 40 in number, 70 mm. to 75 mm. long, arranged in 2, 1. 1, 2 

 or 2. 2. 2, 2 order-, some rays mav bear as many as nine arms in which case, as in all cases, 

 the extra axillarv is external; the division series extend themselves horizontally from the centro- 

 dorsal (that is, at right angles to the dorsoventral axis of the animal) and are very widely 

 separated; all of the division series are 2; they are very narrow and strongly rounded; the 

 extreme ventrolateral border of the ossicles of the division series is produced into a thin flange 

 with a smooth and thin outer border which runs from the distal edge of the interradial production 

 of the radials along the sides of the ray as far as the second brachial ; but this is only visible 

 dorsally as far as the IBr axillary; from the ends of the interradial processes from the radials 

 these flanges are (viewed ventrally) perfectly parallel as far as the IIBr axillary, but as the 

 [IBr series make a very considerable angle with each other the flanges necessarily disappear 

 from dorsal view at the IBr axillary. The union of the ossicles of the IBr series is extremely 

 close, appearing like a syzygy, but the union of the ossicles of the other division series is not 

 so modified. The proximal and distal borders of the ossicles of the division series, including 

 the distal borders of the IBr axillary, are prominently everted, but smooth and not spinous, 

 giving the division series a singularly and characteristically rugged appearance. 



The arms resemble those of .\'. multicolor, the brachials after the eighth or ninth being 

 about as long as broad, triangular, with the outer edge somewhat convex; the distal edges 

 of the brachials are produced, thin, and finely spinous, this production being highest on the 

 side bearing the pinnule (toward the longer side) where it begins abruptly; in the outer part 

 of the arm it gradually becomes less and less marked, beginning less and less abruptly. 



Sy/ygies occur between brachials 3 f 4. 11 -|- 12 to 15 + 16 (usually 1 1 j- 1 2 or 124-13), 

 and again after 4 oblique muscular articulations; the distal intersyzygial interval is 3 oblique 

 muscular articulations. 



