130 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



visible. The radials are rounded, smooth, and distally well separated laterally. The 

 IBr! are three times as broad as long. The IBr 2 (axillaries) are twice as broad as 

 long. The IIBr series are 2, both being young regenerates. The centrodorsal is 

 almost completely concealed by the cirri. The cirri are XXIII, 10-14, from 3 to 7 mm. 

 in length. The first segment is short, the second is about as long as broad and is 

 centrally constricted, the third is half again as long as broad, and the fourth is twice as 

 long as broad and is strongly constricted centrally. The succeeding segments are 

 shorter, and the antepenultimate is one-quarter again as long as broad. The height 

 of the opposing spine is equal to one-third the width of the segment bearing it. The 

 terminal claw is a little shorter than the penultimate segment. P, is 4 mm. long, with 

 22 segments. P 2 is 4.2-5.5 mm. in length, with 20 segments. P 3 is 4.3 mm. long, with 

 19 segments. P 4 is 3.8 mm. long, with 15 segments. P 6 is 3 mm. long. The length 

 of the distal segments is twice the breadth. The basal segments have weak prom- 

 inences. The distal pinnules are 5 mm. long, with 18 segments which are very long, 

 being four to five times as long as broad. The disk is incised and bears calcareous 

 granules along the ambulacral furrows. The anal cone is long and narrow, 1.5 mm. 

 high. 



The three specimens from Bock's station 47 are all young. In one the IBr, are 

 twice as broad as long. The distal intersyzygial interval is three or four muscular 

 articulations. In another the IBr, are one r quarter again as broad as long. The 

 distal intersyzygial interval is 4-8 muscular articulations. In the third the IBr t are 

 twice as broad as long. The distal intersyzygial interval is six muscular articulations. 

 P 6 is 3.5 mm. long with 14 segments. The disk is "lean" and incised, 2-3 mm. in 

 diameter. The anal funnel is 1.5 mm. high. 



In one of the specimens from Bock's station 59 the centrodorsal is flat with the 

 free dorsal pole granular, 3.5 mm. in diameter. The cirri are XXV, 20-21, from 17 

 to 22 mm. long, arranged in a partially double marginal row. The first and second 

 segments are short, the third is about as long as broad, the fourth is a little longer, and 

 the fifth and sixth are about one-third again as long as the distal width. The length 

 of the following segments slowly decreases. The proximal segments are constricted 

 centrally with their distal ends especially broadened. The antepenultimate segment 

 is one-quarter again as long as broad. The opposing spine is inconspicuous, its height 

 being equal to one-quarter the width of the segment which bears it. The terminal 

 claw is pointed, and is about as long as the penultimate segment. The radials are 

 partly concealed by the centrodorsal and are visible only as very narrow bands. The 

 IBri are four times as broad as long and are free laterally. The IBr 2 (axillaries) 

 are low pentagonal, three times as broad as long. The IIBr and IIIBr series are 2. 

 The 24 arms are all broken. The first 10 brachials are discoidal, and those following 

 have oblique ends that are somewhat overlapping and are armed with small spines. 

 There is a weak synarthrial tubercle on the articulation between the first and second 

 brachials. Syzygies occur between brachials 3 + 4, 8+9, and 14+15 and distally at 

 intervals of 4 or 5 muscular articulations. P! is 5.5 mm. long, with 22 segments. P 2 is 

 about 10 mm. long, with 36 segments. P 3 is 13 mm. long, with 40 segments. P 5 is 

 about 9 mm. long, with 29 segments. P !0 is 6 mm. long, with 15 segments. P t to 

 about P 7 have the first-fifth or -sixth segments provided with large prominences, which 

 in height are equal to from one-third to one-fourth the width of the segments. The 



