A MONOGRAPH OF THE EXISTING CRINOIDS 349 



The cirri are X-XVIII, 9-15 (usually 10-12), from 5 to 9 mm. in length. The 

 first segment is twice as broad as long, closely united with the centrodorsal. The 

 second is as long as broad. The third-eighth segments are slightly longer than broad, 

 the articulations between them very oblique in lateral view. The opposing spine is 

 small but distinct, equal to one-fourth the width of the penultimate segment in height. 

 The terminal claw is long and sharp, half again as long as the penultimate segment, 

 in its proximal portion abruptly recurved (at an angle of from 60 to 90). 



The 10 arms are of very different lengths. The long anterior arms are more 

 slender than the others, from 65 to 95 mm. long, and are always provided with ambu- 

 lacral furrows. The posterior arms are about two-thirds the length of the anterior, 

 from 35 to 45 mm. long, and are thicker and more robust, and usually without 

 ambulacral furrows. The brachials from the eighth to the thirtieth are much enlarged 

 and broadened. 



The radials are in most cases concealed by the centrodorsal; if not, there is a 

 dorsal tubercle proximally in the median line. The elements of the IBr series and the 

 first 2 brachials are united by syzygy. The IBr[ are short and bandlike, laterally 

 united, about five times as broad as long. The IBr 2 (axillaries) are pentagonal, with 

 the distal angle of more than 90 and often with a shallow dorsal notch at the point. 



The first brachials are more or less united interiorly. About the first 7 brachials 

 are discoidal, those following being produced distally in a tonguelike process alter- 

 nately on the right and left. A feebly developed keel, usually light colored, runs 

 along the dorsal median line of the arms. 



Syzygies occur between brachials 1+2 and 3+4, then at about the tenth bra- 

 chials, again at about the sixteenth brachial, and distally at intervals of 6 muscular 

 articulations. 



P! is from 9 to 11 mm. in length and consists of 30-45 segments, of which the 

 distal 25-30 bear teeth. The second and third segments of PI and to a still greater 

 extent of P 2 are broadened and carinate. P 3 is a little shorter than P t with up to 

 30 segments and a comb consisting of from 10 to 25 teeth. From P 3 onward the 

 pinnules are composed of shorter and stouter segments; they are 4 or 5 mm. in length, 

 composed of 15-20 segments, and do not bear combs. The 4 outermost segments 

 have the dorsal spines more developed and strengthened by hooks, of which there 

 are 1 or 2 rows on each segment with about 3 hooks in each row. On the pinnules 

 immediately following P 2 there are rudimentary combs, the teeth of which are shaped 

 like small ventrodistal prominences. 



Doctor Gisle"n pointed out that of the 11 specimens which he determined as 

 C. pectinata none had a complete and continuous row of cirri, there being always 

 from one to four breaks or gaps in the series. 



The 2 specimens in the British Museum from near Cape Voltaire are both small. 



The 2 examples from Baudin Island in 14.6-27.4 meters are both small. 



One of the specimens from Holothuria Bank (62.1 meters) has 11 arms. 



The single specimen from Dundas Strait is young. 



One of the specimens from Mer, Murray Islands, in the collection of the Museum 

 of Comparative Zoology has the arms 190 mm. long and the cirri XV, 13-14, thus 

 showing a close approach to C. Solaris. Of the other specimens the largest has the 

 arms about 150 mm. long. 



