PART 5 A MOXOGRAPH OF THE EXISTING CRINOIDS 481 



water pore. The second brachials are much larger than the first, in direct dorsal view 

 almost equilateral triangles; the outer border is slightly concave, and the distal edge is 

 slightly spinous. The first syzygial pair (composed of brachials 3+4) is sUghtly 

 longer interiorly than exteriorly, about twice as broad as long in the median line, 

 the sides slightly concave, the distal edge very finely spinous. Tlie following brachials 

 rapidly become obliquely wedge-shaped, after the second syzygy triangular and as long 

 as broad with very finely spinous edges, and later obliquely wedge-shaped again. The 

 brachials have projecting and overlapping finely spinous distal edges, and their dorsal 

 surface is marked with fine parallel longitudinal ridges. 



Syzygies occur between brachials 3+4, 9 + 10, and 14+15, and distally at intervals 

 of 4 (more rarely 3) muscular articulations. The width at the first syzygy is 1.9 mm. 

 and the length from the IBri to the second syzygy is 11.5 mm. 



Pi is from 12 to 13 mm. long and is composed of 19 or 20 segments, of which the 

 first is slightly longer than broad, the second is about half again as long as broad, the 

 third is about twice as long as the proximal breadth, and the fourtli and following are 

 about two and a half times as long as broad. Pi is the longest pinnule on the arm, 

 though it is ojily slightly longer than the distal pinnules; it is smooth with long segments, 

 rather stiff and moderately stout, tapering moderately in the proximal third, more 

 gradually from that point onward. In its general appearance, especially in the very 

 close union of its component segments, it recalls Pi in the larger species of Psathyrometra. 

 P2 is from 10.0 to 10.5 mm. in length with 17 segments, sunilar to Pi but tapering 

 rather more evenly. P3 is 8 mm. long ^\-ith 13 or 14 segments, similar to Pi and P2, 

 but ^^'ith the segments moi'e enlarged distally, and proportionately smaller. P4 is 

 5.5 mm. long with 12 or 13 segments, similar to P3 but %vith the distal segments slightly 

 more elongated. P5 is 5.5 mm. long, resembling the preceding pLnnule but more 

 slender, with 12 or 13 segments, of which the distal are more elongated. P, is 7 mm. 

 long with 15 segments, longer, less slender, and less stiff than those preceding. The 

 distal pinnules are exceedinglj- slender, from 11 to 12 mm. long, with 23 segments, of 

 which the first tMO are usually enlarged and the following are moderately elongate with 

 swollen articulations and finelj- spinous ends. 



Notes. — In a specimen from station 59 of the Danish Expedition to the Kei Islands, 

 the centrodoi-sal is large, a rather broadly trujicated cone witli swollen sides 4.5 mm. 

 in basal diameter and 3.5 mm. high, viewed radially. The dorsal pole, which is about 

 2 mm. in diameter, is rather deeply concave. The sides are completely covered with 

 closely set cirrus sockets. 



The cirri are LXX, 39-^7. 



The radials are visible as a nan-ow band beyond the rim of the centrodorsal. 

 Their distal border forms a very broadly obtuse angle with a round apex in the median 

 line, and is somewhat produced. 



The IBri have strongly convergent sides and are deeph' incised in the median 

 line. The lateral portions bear a small group of short, blunt, stumplike spines, and 

 tbe median line is rather strongly elevated and broadly rounded. 



The IBr2 (axillaries) are rhombic, about as long as broad, with a strong rounded 

 posterior process deeply incising the IBri, and a sharp and acute distal angle. The 

 outer portion of the pro.ximal border, ^Wthin the sharp lateral angle, bears an abrupt 

 flangelike extension or a row of tubercles. 



The arms are about 70 mm. long. 



