664 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



are about to develop. The columnals have now attained their definitive form. They 

 are rather short, and are not constricted centrally. The proximal 5 are gradually 

 broadening, the topmost, bearing the cirri, being the broadest. 



There is considerable variation in the column in regard to both the number and the 

 shape of the component columnals. 



In one column there are only 8 segments remaining, the ninth having been the 

 centrodorsal of the young comatulid which has broken away. In another fully devel- 

 oped column the lowest segment is small and wedge-shaped. In a third the lowest 

 segment is also somewhat wedge-shaped, but apparently would have become consider- 

 ably larger than those following. In a fourth the 2 lowest segments would apparently 

 have become larger than those following. In one the lowest segment is much smaller 

 than the next. 



These differences are correlated more or less with the manner and place of attach- 

 ment. A wedge-shaped first columnal results from attachment in the narrow space 

 between 2 pinnulars. When the first columnal is attached on a normal surface, either 

 on the middle or on the end of a pinnular, it acquires the usual form. 



Localities. Antarctic (Swedish South Polar Expedition) station 59; Burdwood 

 Bank Gat. 5341' S., long. 6110' W.); 137-150 meters; bottom temperature 3.20 C. 

 [Mortensen, 1918] (1, Stockholm M.). Type locality. 



Discovery Investigations station 175; Bransfield Strait, South Shetlands (lat. 

 6317'20" S., long. 5948'15" W.); 200 meters; at 190 meters, temperature 0.48 C., 

 salinity 34.34% ; niud, stones and gravel; March 2, 1927 [John, 1938] (1, B.M.). 



Geographical range. -The Burdwood Bank, near the Falkland Islands, and from 

 the Bransfield Strait. 



Bathy metrical range. 150 (7137) to 200 meters. 



PHRIXOMETRA RAYNERI John' 



Phrixometra rayneri JOHN, Discovery Reports, vol. 18, 1938, p. 123 (listed), p. 129 (distribution table), 

 p. 132 (in key), pp. 172-174 (station; description); fig. 12, p. 173; pi. 4, fig. 8. 



Diagnostic features. The cirri are about XXX, 14-17; P! (in the single specimen 

 known) has 11 to 12 segments and is 3 mm. long; P 2 with 13 to 14 segments is 4 mm. 

 long and P 3 , the first genital pinnule, with 9 segments is 3 mm. long. 



Description. The centrodorsal is small, low and rounded; its dorsal pole is rather 

 large and rough. The edge is produced into slight corners interradially. The cirrus 

 sockets are closely set in two rows around the periphery. Their arrangement is im- 

 possible to determine with so many of the cirri intact, or at least with their basal seg- 

 ments remaining. According to Dr. John they are in columns, but if so these are not 

 very regular. So flared are the basal cirrus segments and so closely crowded are then* 

 sockets that I [A.M.C.] can distinguish no regular arrangement. 



The cirri are about XXX, 14-17. Those of the peripheral row are the longest, 

 about 6 mm. long while the more apical ones are about 5 mm. The second segment 

 is about as long as broad, the first one being much shorter. The third to the fifth 

 are the longest, they are slightly constricted in the middle, a little more strongly on 

 the dorsal than on the ventral side. The distal ends of the second to the fourth or 

 fifth segments are expanded very noticeably and thorny. The outer segments are 



* See also Addenda (p. 837) under 1963. 



