146 DISCOVERY REPORTS 



St. 190. 24. iii. 27. Bismarck Strait, Palmer Archipelago. 64° 56' S, 65° 35' W. 130-100 m. 

 Gear DLH, NRL. Bottom: mud, stones and rock. One specimen. 



St. 599. 17. i. 31. Adelaide Island. '67° 08' S, 69° o6|' W. 203 m. Gear DLH. Bottom: no data. 

 Four specimens. 



St. 1652. 23. i. 36. Ross Sea. 75° 56-2' S, 178 ' 35-5' W. 567 m. Gear DRR. One very young 

 specimen. 



St. 1660. 27. i. 36. Ross Sea. 74° 46-4' S, 178" 23-4' E. 351 m. Gear OTL. Bottom: mud. 

 One very young specimen. 



I had written a full description of this species before knowing that Mr Clark had found 

 it in the Australasian Antarctic collection and described it. I think it useful to add the 

 following remarks and to publish the figures I had prepared. 



The arms of the eight specimens vary in length from 50 to no mm. 



I find the cirri to be XL-LXV, 16-31, but mostly 24-26. The most elongated seg- 

 ments, the fourth to seventh, are not quite so elongated as in Clark's description; the 

 most distal are slightly longer : they are longer than their distal widths. 



Clark describes how the distal edges of the radials are considerably produced out- 

 wardly at the sides. In all but one, a small specimen, of the present collection the distal 

 edge of the radial is produced into a thin lip-like frill which may stand out at right angles 

 or be curved farther backwards. It has the appearance of being formed of a row of 

 spines all but the points of which are connected by a web, and it is stronger on the sides 

 than in the mid-line. The distal edge of the costal is produced into a similar thorny frill. 



Fig. 3 b-e shows the shapes of the brachials. The spinous processes on the distal 

 edges of the lower brachials give the animal a very characteristic appearance. They may 

 be small on, or absent from, the first and second brachials. They are strongest between the 

 first and second syzygial pairs where they stand out at right angles to the arm. On the 

 brachials beyond the third syzygy they are forwardly directed but still coarse and strong. 

 (They are stronger than appears in Fig. 3 d which, being a dorsal view, does not show 

 how strongly the edge of one segment overlaps the beginning of the next.) They persist 

 to the end of the arm. 



On one arm of one specimen there is only a single ossicle, larger than the normal 

 first or second brachial, between the axillary and the first syzygial pair. 



In the smallest adult specimen Pi is of 25 segments, in the others of 28-39 segments and 

 up to 12 mm. long. P2 has from 24 to 38 segments. P3 may be a whip-like oral pinnule, 

 with heavier basal segments than the others, but in most of the specimens it is a genital 

 pinnule. 



The earlier genital pinnules may be considerably shorter than the orals. The number 

 of segments in the genital pinnules varies from 14 to 23, the proximal usually having 

 a smaller number than the distal. All but the first two segments are longer than broad. 

 The distal edge of each is produced into a row of spines. The distal pinnules are like the 

 genitals but slightly longer, of 20-30 segments. 



The disk is naked. 



Sacculi are abundant. 



In some of the specimens there is a single row of small fenestrated plates along each 



