A MONOGRAPH OF THE EXISTING CRINOIDS 391 



The radials are short, about twice as long in the interradial angles as in the 

 median line, evenly curved anteriorly. The IBri are short, oblong, about four times 

 as broad as long. The IBr 2 (axillaries) are triangular, rather less than twice as broad 



as long. The IBr,, IIBr; and first brachials have somewhat produced and flangelike 

 lateral edges by' which* they^aro in apposition laterally. The lateral borders of the 

 aixillaries are angular or very short, and sometimes are more or less produced, the 

 production equaling the width of the lateral projection of the immediately preceding 

 ossicles. The IIBr series are 2, resembling the IBr series and, like them, rising to a 

 rounded tubercle on the line of the articulation between them. 



The 15 arms are 70 mm. long. The first brachials are short, slightly longer out- 

 wardly than inwardly where they are united for almost or quite their entire length. 

 The second brachials are about twice as long, irregularly quadrate. The first syzygial 

 pair (composed of brachials 3+4) is not quite so long as broad, and is slightly con- 

 stricted centrally. The next 2 brachials are slightly wedge-shaped, about twice as 

 broad as long, and the following are triangular, about as long as broad with the longer 

 side convex and the distal edges slightly overlapping. Distally the brachials become 

 very obliquely wedge-shaped; the terminator 5 are very small, and fall about 5 mm. 

 short of the ends of the distal pinnules. 



Syzygies occur usually, but not always, between brachials 3 + 4, 9+10 to 13+14, 

 and distally at intervals of 3 or 4 muscular articulations. 



P! is 5 mm. long, very slender, flexible and delicate, composed of 20 segments of 

 which the first is greatly expanded, about as broad as the entire lateral edge of the second 

 brachial, the second is similar but smaller, and the remainder very small and about as 

 long as broad with the distal ends prominent. P 2 is 7 mm. long, much stouter than 

 PI and stiff, with 20 segments of which the first is short, but as broad as tne outer 

 side of the segment, the second is longer but not so broad, the third is about half 

 again as broad as long, the fourth is about half again as long as broad, and the re- 

 mainder become progressively elongated, with the distal ends increasingly prominent. 

 The following pinnules are similar, gradually decreasing in length to about P 8 , which 

 is 5 mm. long, then increasing again and reaching 8 mm. distally. The enlargement 

 of the first two segments is marked on the first 3 pinnules, then decreasing markedly 

 and remaining practically uniform to the end of the arm. In the distal pinnules the 

 first segment is crescentic, about half again as broad as the third, the second is trap- 

 ezoidal, about twice as broad as long, and the remainder are about twice as long as 

 broad. The pinnules in section are triangular with the corners rounded, especially 

 on P! and P 2 . 



Description of the jorm formerly designated as separata. The centrodorsal is 

 discoidal, rather thick, with the broad bare polar area slightly convex; there is a single 

 crowded row of about 15 cirrus sockets. 



The cirri are XV, 30-35, 15 mm. long, resembling those of Neometra multicolor. 

 But while generally the longest proximal cirrus segments are not more than half again 

 as long as broad, exceptionally slender cirri sometimes occur in which the longest 

 segments are more than twice as long as broad. There is one of these exceptionally 

 slender cirri in the type specimen of separata, and the only remaining cirrus in the 

 type specimen of callista is of this character. 



