A MONOGRAPH OF THE EXISTING CRINOIDS 157 



entire dorsal edge. On these more distal segments its apex is subterminal. The distal 

 edge of all the segments beyond the fourth is produced into a delicate, transparent, 

 finely dentate collar which is narrow on the more proximal segments, and wider, es- 

 pecially on the dorsal side, on the distal segments. The opposing spine arises from nearly 

 the whole of the dorsal edge of the penultimate segment; it is strong and is directed a 

 little forward. The terminal claw is strong and curved. 



The radials are comparatively long, in the midradial line about one-sixth as long 

 as broad. Their distal edges are concave. The IBri are four times as broad as long, 

 narrower distally than proximally, strongly rounded dorsally, widely separated from 

 each other and not incised by the IBr 2 . The proximal edge is convex, the distal con- 

 cave. The IBr 2 (axillaries) are a little broader than long with strongly rounded sides. 

 The proximal edge is gently convex, not angular. The distal edge is produced into 

 a fairly long projection in the midradial line and is concave on either side of this. One 

 of the radials bears a long rodlike tubercle, but the others are bare. Large well spaced 

 tubercles on the division series and lower brachials are the most conspicuous feature of 

 this animal, even to the naked eye. These tubercles stand out at right angles to the 

 surface of the ossicles; most of them are rodlike, though some are flattened and blade- 

 like. Their arrangement has an order that is not at first sight apparent. On the 

 IBrj the middle point of the proximal border is raised into a blunt spine, a low knob, or 

 a bigger lip. In front of and on either side of it in the proximal half of the ossicle stand 

 two tubercles. There are usually two or three tubercles laterally, on each of the 

 rounded sides. In most of the IBr 2 the proximal edge is produced outward into two 

 small triangular lips, one on either side of the middle point; in front of and between 

 these lips, in the midradial line, is a single strong tubercle. Along either side of the 

 distal edge there are three to five tubercles. There may be additional lips or there may 

 be tubercles along the lateral parts of the proximal edge, and there are usually two or 

 three tubercles on each of the rounded sides. The greater part of the dorsal surface 

 near the midradial line is free from tubercles. 



The first brachials are roughly rectangular, more than half as long as broad, and 

 are not incised by the second. They carry about five to eight tubercles, some placed 

 in the proximal half, a few on the proximal edge itself, and the others on the rounded 

 exterior side. The distal half of the dorsal surface, except for the exterior side, is usu- 

 ally free from tubercles. The second brachials are irregular in shape, wider distally 

 than proximally, a little wider than long. The distal and outer edges are straight, 

 the interior is oblique, and the narrow proximal edge is slightly rounded. The large 

 tubercles lie along and near the proximal and distal edges, leaving the middle of the 

 dorsal surface smooth. The hypozygal of the first syzygial pair is about twice as 

 broad as long. There are large tubercles along the proximal edge, and there may be 

 smaller tubercles along the distal edge. 



Pi is the oidy pinnule present, and only one of these is nearly complete. It is 

 about 8 mm. long and is composed of 17 segments. The first segment is rounded, about 

 as long as broad, with the dorsal edge raised distally into a low prominence. The 

 segments immediately following are broader than long. The second bears two promi- 

 nences dorsally and distally, one on each side, the inner (nearer the arm) being the larger. 

 On the third to the fifth or sixth segments both prominences are considerably larger. 

 The inner arises from the whole of the lateral edge as a high narrow ridge with the same 



