A MONOGRAPH OF THE EXISTING CRINOIDS 135 



and the other below it near the proximal edge, the distal being somewhat the stouter and 

 longer. There is a similar but shorter spine on each side near the anterolateral angle. 

 The IBr 2 (axillaries) are rhombic, nearly or quite twice as broad as long, with the 

 lateral angles extending considerably beyond the anterolateral angles of the IBi'i. The 

 two anterior sides are everted and bear a group of short spines or serrations near the apex 

 between them. In the proximal two-thirds of the middorsal line there is a high narrow 

 crest which may be more or less deeply notched in the middle so as to form two points, 

 of which the distal is the higher and sharper. 



The 10 arms were probably about 50 mm. long. The first brachials are somewhat 

 more than three times as broad as the median length, slightly longer exteriorly than 

 ulteriorly, with the proximal and distal edges straight and nearly parallel; the borders 

 are slightly and narrowly swollen and the inner sides are in apposition for their entire 

 length. A high spine, sometimes laterally broadened, rises abruptly from the middle 

 of the distal border. The second brachials are larger than the first, irregularly quadrate 

 with the proximal border extended downward as a rather long broadly rounded process 

 the inner side of which runs distally at an angle of about 45 so that the inner edges 

 of the second brachials meet considerably above the anterolateral angles of the first 

 brachials forming a conspicuous water pore. The borders of the second brachials are 

 slightly thickened or everted and the middorsal line bears a narrow but distinct carina- 

 tion which may be produced into a short point at the anterior end, or at both ends. The 

 first syzygial pair (composed of brachials 3+4) is about one-third again as long as 

 broad, with the hypozygal and epizygal of equal length; both have a faintly indicated 

 middorsal carination which on the epizygal may be produced into a point at the distal 

 end. The next two brachials are oblong, about half again as broad as long, and those 

 following soon become very obliquely wedge-shaped and about as long as broad, and 

 distally elongate. The first two brachials following the first syzygial pair may be 

 somewhat abruptly convex in the middorsal line, but those following are evenly rounded 

 dorsally with smooth distal edges which are not produced. 



Syzygies occur between brachials 3+4, 14+ 15, and 18+ 19, and distally at intervals 

 of 3 or 4 muscular articulations. 



PI is 4.5 mm. long with 11 segments, much longer and stouter than the following 

 pinnules, stout at the base and tapering to a fine tip. The first three segments are 

 about as long as broad and those following gradually become elongated and twice 

 as long as broad terminally. A high and sharp ridge runs along the distal border of the 

 outer face. P 2 is 2.5 mm. long with 7 segments, more slender than P t and tapering 

 more gradually ; the first two segments are about as long as broad and the terminal are 

 half again as long as broad. The following pinnules resemble P 2 . The distal pinnules 

 are 4.5 mm. long with about 15-18 segments of which the first is broader than long, the 

 second is about as long as broad, and those following are mostly about twice as long 

 as broad. The distal pinnules are much compressed with a sharp carinate ridge running 

 along the outer side, the ridge on each segment ending in a tuft of spinules. 



Locality. Albatross station 4107 ; Hawaiian Islands; Lae-o Ka Laau Light, Molokai 

 Island, bearing S. 3430' E., 12.3 miles distant; 640-649 meters; coral, sand, and foram- 

 inifera; bottom temperature 5.33 C.; July 24, 1902 [A. H. Clark, 1908, 1909, 1912, 

 1918, 1949] (1, U.S.N.M., 36079). 



