PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 477 



the distal border moderately concave, and the lateral borders straight with a much 

 broadened single tubercle, or sometimes 2 or 3 tubercles, at the anterolateral angles. 

 The IBr 2 (axillaries) are rhombic, broader than long, with a rounded posterior process 

 incising the IBr t ; tne lateral edges are somewhat produced into a rounded flange-like 

 process, these processes on adjacent IBr 2 being almost or quite in apposition. 



The 10 arms are from 25 to 35 mm. long. The first brachials are wedge-shaped, 

 nearly twice as long outwardly as inwardly, interiorly united for most of their length. 

 The second brachials are larger and irregularly quadrate. The first syzygial pair 

 (composed of brachials 3+4) is about as long as broad, with the sides somewhat con- 

 cave. The fifth and sixth brachials are oblong, not quite twice as broad as long, and 

 those following are wedge-shaped, about as long as broad, gradually becoming more 

 elongate distally, the terminal brachials being twice as long as broad or even longer 

 with almost parallel ends and swollen articulations. 



Syzygies occur between brachials 3+4, 9 + 10, and 14 + 15 (the last 2 somewhat 

 irregular) and distally at intervals of 2 muscular articulations. The arm width at the 

 first syzygy is 0.8 mm. and the length from the proximal edge of the IBr, to the second 

 syzygy is 6.5 mm. in the specimen from Albatross station 3755, Sagami Bay. 



PI is 4 mm. long, moderately stout and evenly tapering, composed of 12 segments, 

 of which the first is about as long as broad and the remainder about twice as long as 

 broad, the terminal rather longer; from the third onward the segments have the distal 

 ends everted, somewhat overlapping, and armed with small spines, this feature be- 

 coming progressively more pronounced distally. P a is absent. P 2 is similar to P, but 

 shorter and rather less stout, with the component segments proportionately slightly less 

 elongate. P 3 to P, are similar, but the first two segments are about as long as broad 

 and there is a long gonad on the third to sixth segments. The following pinnules grad- 

 ually increase to 6 mm. in length with about 12 segments, of which the first is short, the 

 second is trapezoidal and about as long as its basal width, and the remainder are much 

 elongated with swollen articulations. 



Notes. The specimen secured by Captain Suensson had the arms 25 mm. and 

 the cirri 5 mm. in length. 



In the specimen recorded by Dr. Torsten Gislen in 1922 the cirri were XXXII, 

 the peripheral 7 mm. long with 25-28 segments, and the apical 2.5 mm. long with 15-16 

 segments. The IBr, had 3 small tubercles on either side. P, was 3.5 mm. long with 

 9 segments of which the distal had slightly produced and slightly spinous distal ends. 

 P 2 was 2.5 mm. long with 8 segments, similar to PI. P 3 was about as long as P 2 , and 

 was composed of 9 segments. P a was absent. The disk bore large calcareous granules, 

 and there were also interbrachial granules. The color was salmon red, the cirri white. 



In 1927 Dr. Gislen described another specimen which had about XXV cirri with 

 20-27 segments and measuring 6-8 mm. in length. The IBr, was half as long as wide, 

 the IBr 2 (axillary) two thirds as long as wide. There was hardly any synarthrial 

 thickening. The syzygial interval was 3 muscular articulations. P, with 8 segments 

 was 2.5 mm. long; P 2 with 8 segments was 2.2 mm. long; P 3 also with 8 segments was 

 2.3 mm. long and bore a gonad. P b with 7 segments was 1.5 mm. long. The distal 

 segments had spiny crowns distally. The disk diameter was 2.5 mm. and there wen- 

 coarse interradial calcareous granules. The arm bases were well separated laterally. 



Localities. Albatross station 4894; southwest of the Goto Islands; Ose Saki Light 

 bearing N. 41 E., 5 miles distant Gat. 3233'00" N., long. 12832'10" E.); 173 meters; 



