A MONOGRAPH OF THE EXISTING CRINOIDS 35 



rigid, tapering very slowly and recurved distally. The first segment is about thi-ee 

 times as broad as long, and those following increase in length, becoming about as long 

 as broad on the fourth and about one-third again as long as broad distally. The 

 sixth or seventh and following segments have the outer portion of the distal border 

 everted and very finely spinous, this feature being almost imperceptible at first and 

 increasing in amount distally. 



P3 is 5 or 6 mm. long with 11 or 12 segments, small and weak, basally about 

 as broad as, or narrower than, P,, and distally tapering more rapidly. The first seg- 

 ment is short, the fourth is not quite so long as broad, the fifth is one-third again 

 as long as broad, and the distal are twice as long as broad. 



The color is light purphsh gray with narrow deep pui'plish-brown lines along each 

 articulation in the arms and pinnules. The division series have numerous rather large 

 regular rounded spots of deep purplish brown. The cirri are light dull grayish. 



In the specimen from Neira, Banda, the cirri are XXII, 35-43 (usually 35-36), 

 30 mm. long. The cirrus segments are subequal, about twice as broad as long. On 

 the seventh or eighth segment the distal dorsal edge shows a noticeable thickening. 

 This gradually becomes concave on its distal border, and at the same time the median 

 portion of the dorsal surface becomes raised so that on about the fifteenth segment 

 the dorsal surface bears a blunt median carination which, at about two-thirds of the 

 distance from the proximal to the distal end of the segment, branches, the two branches 

 running, at right angles to each other, to the distal edge. There is also a notch in the 

 proximal end of the keel. The segments in the distal third of the cirri bear dorsaliy 

 two elongated tubercles, one on either side of the middorsal line, which taper toward 

 each end and in the middle are slightly concave exteriorly and more strongly convex 

 Ulteriorly so that they come into contact in the middorsal line, although their sunomits 

 are always separated by a narrow groove. Toward the tip of the cu'ri they become 

 progressively united, so that on the last six segments preceding the opposing spine 

 there is simply a single elongated and rather narrow middorsal tubercle. The opposing 

 spine is stout, conical, vnth the apex median, arising from the entire dorsal surface of 

 the penidtunate segment, its height being equal to about half the width of that seg- 

 ment. The terminal claw is about as long as the penultimate segment and is stout and 

 rather abruptly bent at the end of the proximal third. 



There are 39 arms 105 mm. long. The arms on the several postradial series are 

 4-|_4^ 3 + 4, 4 + 5, 4+4, and 3+4. An additional division series on a postradial series 

 is always external, or if a IIBr series bears three arms mstead of the usual four the 

 internal branch is undivided. 



P, is 10 mm. long with 23 segments, moderately slender but not flagellate, tapering 

 slowly and regularly from the base to the tip. The fu-st segment is nearly twice as 

 broad as long and those succeeding gradually increase in length so that the fifth is 

 about as long as broad and the ninth or tenth and following are about twice as long 

 as broad. The second-fifth segments have the outer side (toward the arm tip) mod- 

 erately produced into a low carination with a straight crest and broadly rounded 

 angles, the surface of which is roughened. The last five or six segments have the 

 distal outer angle slightly overlapping the base of the segment succeeding, so that 

 the outer profile of the pinnule tip is sharply and regularly serrate. 



P2 is 15 mm. long, stout and much stiffened, about twice as stout basally as 



