Clark — Three Additions to the Crinoid Fauna of Japan. 107 



Cirri xxvii, 16-21 (usually 18 or 19), 10 mm. long; the first segment is 

 short, much broader than long, and the following gradually increase in 

 length to the fourth or seventh (usually fifth or sixth) which, with the 

 remainder, is about as long as broad; on the second or third segment the 

 median portion of the distal dorsal edge becomes produced, this produc- 

 tion on the two or three following involving the entire distal edge so that, 

 viewed dorsally, it appears as acrescentic ridge with a serrate apex, the 

 horns of the crescent touching the distal dorsal angles of the segments ; 

 gradually this crescent becomes straightened out so that beyond about 

 the middle of the cirrus each segment bears a straight median serrate 

 transverse ridge ; viewed from the ends of the segments these transverse 

 ridges usually show a more or less convex profile, though on some of the 

 cirri they may be nearly straight ; distally these ridges become gradually 

 narrower, on the antepenultimate segments being commonly represented 

 by sUght median tubercles ; the opposing spine is terminal or subterminal ; 

 erect, in height equal to about half the distal diameter of the penultimate 

 segment, though sometimes longer ; its base occupies nearly or quite all 

 of the dorsal surface of the penultimate segment; the terminal claw is 

 about as long as the penultimate segment, stout in the proximal third, 

 but slender in the distal two-thirds, which portion usually is rather 

 abruptly bent downward. 



The ten arms are probably between 55 mm. and 60 mm. long. 

 The radials are even with the edge of the centrodorsal ; the IBrj are 

 short, about four times as broad as the median length, which is about 

 one third less than the lateral length ; the lateral edges are straight, and 

 in apposition ; the IBr2 (axillary) is rhombic, broader than long; the 

 first brachial is short, trapezoidal, twice as long exteriorly as interiorly, 

 the inner edges united for about the proximal two-thirds; the second 

 brachial is larger, irregularly quadrate; the third and fourth brachials 

 form a syzygial pair which is slightly longer internally than externally, 

 nearly or quite twice as broad as the lesser (exterior) length; the next 

 two brachials are slightly wedge-shaped, three or four times as long as 

 the median diameter, and the following become more and more pro- 

 nouncedly wedge-shaped and after the fourteenth triangular, about as 

 long as broad, and distally wedge-shaped again, and shghtly longer than 

 broad. Syzygies occur between the third and fourth brachials, again 

 between the thirteenth and fourteenth ( sometimes between the ninth and 

 tenth or tenth and eleventh), and distally at intervals of from four to 

 seven (usually five) oblique muscular articulations. 



Pi is 8 mm. long with fourteen segments of which the first is half again 

 as broad as long, the second is slightly trapezoidal, half again as long as 

 the distal diameter, the third is twice as long as broad, and the remainder 

 are from three to four times as long as broad ; the seventh and following 

 have very prominently everted and spinous overlapping distal edges. Pz 

 is 8 mm. long with sixteen segments, similar to Pi but with the segments 

 proportionately slightly shorter ; the sixth and following have very prom- 

 inently everted and spinous distal edges. P3 is 8 mm. long with fourteen 

 segments, similar to P2. P4 is 5 mm. long with fourteen segments, 



