A MONOGRAPH OF THE EXISTING CKINOIDS 595 



claw is longer than the penultimate segment, stout, and moderatelj^ curved. The 

 third, fourth, and fifth segments are constricted centrally with enlarged ends and are 

 rounded in cross section. The following segments are rather strongly flattened 

 laterally, so that in a lateral \aew the cirri appear to increase in width distally. In 

 some specimens the distal ends of the cirrus segments are slightly overlapping, 

 gi\Tug the cirri a peculiar rough appearance. 



The radials are concealed by the centrodorsal. The IBr, are usually entirely 

 concealed except in the interradial angles of the calyx. The IBr2 (axillarics) are 

 triangular, twice as broad as long, just in apposition laterally. The IIBr scries are 

 4 (3 + 4), the series usually being slightly deficient. The IIIBr series are 4 (3 + 4), 

 but are only developed in a single individual. 



The arms are 15-21 in number, from 60 to 70 mm. in length, rather slender. 

 The first brachials are nearly oblong, about three times as broad as the exterior 

 length, and almost entirely united interiorly. The second brachials are more wedge- 

 shaped, of about the same size, free interiorly. The first syzygial pair (composed of 

 brachials 3+4) is oblong, from two to two and one-half times as broad as long. 

 The fifth brachial is oblong, about three times as broad as long. The followang 

 brachials are triangular, at first nearly as long as broad but soon becoming shorter, 

 after the proximal third of the arm about twice as broad as long, and in the terminal 

 portion wedge-shaped and shghtly longer. The brachials after the fourth develop 

 rather strongly everlapping distal ends, this character gradually becoming obsolete 

 in the distal half of the arms. 



Syzygies occur between brachials 3 + 4, again in the vicinity of the twelfth brachial, 

 and distally at intervals of 4 muscular articulations. 



The disk is 10 mm. in diameter. The anal area is large, with rather numerous 

 calcareous concretions. The mouth is marginal and the anal tube central. 



Pd is 10 or 11 mm. long, rather slender, tapering evenly in its proximal two- 

 thirds and becoming very slender in its distal third, composed of nearly 30 segments, 

 which become about as long as broad on about the seventh. The terminal comb 

 has 5-7 large rounded triangular teeth. The distal ends of the segments are produced 

 dorsally and are armed with numerous coarse spines. The outer side of the distal 

 dorsal edge also is more or less prominent and spinous, and the whole surface of the 

 segments is studded with prominent, though small, spines. As the pinnule decreases 

 in width distally the spinous processes on the segments gradually become less prom- 

 inent. Pi is similar to Pd and of about the same size. Pj is smaller and more 

 slender, 4 mm. long. P3 is similar to P2, but usually ven,' slightly shorter and more 

 slender. P4 and the following pinnides are somewhat stouter and taper less rapidly, 

 but the distal pinnules become more slender again and reach 5 mm. in length. The 

 genital pinnules have slightly prominent spinous distal ends, and the segments of all 

 the pinnules are armed with larger and more numeroiis spines than usual, the recurved 

 spines on the ternunal 2 or 3 segments being correspondingly enlarged, so that the 

 pinnules have a pccidiar and characteristic harsh feeling and cling tenaciously to 

 anything that will afford a hold, such as cloth or the fingers. 



The color in alcohol is dark brown, beconung buff on the arm tips; the cirri buff. 



