314 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



fifth are markedly elongate, the third the longest; the segments following become 

 gradually shorter, and their distal ends become broader and show produced points 

 so that the dorsal profile of the cirri here appears serrate. The opposing spine is 

 directed outward. 



The radials are largely visible. The lBr 2 (axillaries) show traces of dentation on 

 the proximal and lateral borders, all the other ossicles of the division series being 

 smooth. The arms are all broken off near the base; their number is presumably 10. 

 Hartlaub remarked it is noteworthy that while the radials are in close lateral contact 

 the ossicles of the IBr series are laterally entirely free and do not have sharply flattened 

 sides. 



A second specimen from Blake station 232 is somewhat larger than the type speci- 

 men, with the arms about 40 mm. long. Most noticeable in this specimen is the shape 

 and tilelike imbrication of the elements of the IBr series. As in the type specimen, 

 the radials bear a moderately pointed median tubercle. These tubercles stand in 

 approximately the same height as the strong interradial processes of the centrodorsal 

 so that the base of the postradial series shows a crown of 10 tubercles. The IBri, 

 tapering in its distal half, is approximately trapezoidal and, together with the axillary, 

 bears a conspicuous median angular tubercle and a produced and overlapping proximal 

 border. The IBr 2 (axillary) is almost triangular. One IIBr 2 series is present. 



There were apparently 11 arms. On arms arising from a IBr axillary the first 

 syzygy is between brachials 3+4 and the second from between brachials 14 + 15 to 

 between brachials 17 + 18. Like the elements of the IBr series, the elements of the 

 IIBr series bear an elongate median crest. 



Hartlaub noted that here for the first time there is an indication of the brachial 

 ornamentation so highly developed in the large specimen. The articulations of the 

 brachials are broad and everted so that the individual brachials stand out strongby 

 and the dorsal profile of the arms is almost serrate or dentate. Pi is composed of 12 

 or 13 segments of which the two first appear approximately triangular, those following 

 more rectangular; the second and third are somewhat carinate outwardly; all the 

 segments are of about the same length. P a has four short and approximately squarish 

 segments, those following being longer. P 2 has 10 segments of which the first three 

 are short and the remainder elongated. P d , which is short with 8 or 9 segments of 

 which the first two are short and the others elongated, represents essentially the typical 

 form of pinnule in the middle of the arm. The length of the pinnules apparently 

 decreases gradually from Pi to about P 9 . 



A third specimen from Blake station 232 is larger with the arms about 50 mm. long. 

 The cirri have 10-14 segments of which the first two are short and those following 

 elongate, and the penultimate bears an opposing spine. The form and the tilelike 

 imbrication of the elements of the IBr series are much less characteristic than in the 

 other specimens. In the position of the first and second syzygies and in the presence 

 of one IIBr 2 series there is, however, great similarity; but the IBr axillary is not 

 triangular but almost rhombic, and there is a slight tuberculation or dentation on the 

 overlapping proximal edge of the elements of the IBr scries. 



P 1 is about 6 mm. long with 20-22 segments of which the first five are broad and 

 somewhat carinate and those following are elongate, the terminal becoming shorter 

 again and veiy small. The pinnules following become gradually shorter. Pa or P e is 



