A MONOGRAPH OF THE EXISTING CRINOIDS 445 



individuals are 70-105 (most commonly 75-90) mm. long; cirri XI-XXIII (usually 

 XVI-XX), 60-100 (usually 75-85), 55-73 (usually 55-65) nun. long. 



Description. The centrodorsal is columnar with the tip conical, truncated, with 

 an apical crater surrounded by 5 prominent tubercles which are interradially situated. 

 Low ridges run from each of these tubercles along the conical portion of the centro- 

 dorsal as far as the distal cirri. The cirrus sockets are arranged in 10 columns, the 

 2 columns in each radial area being separated from those in the adjacent radial areas 

 by bare lines or shallow grooves which are equal in width to from half to three-quarters 

 of the transverse diameters of the cirrus sockets. 



The cirri are XX, 80, 60 mm. in length, fairly uniform in width but tapering 

 at the tip. The first six or seven segments bear prominent dorsal spines and the follow- 

 ing are smooth to about the twentieth where the cirri begin to become compressed and 

 dorsal spines begin to develop which become prominent distally. The terminal claw 

 is minute, bluntly conical, less than the penultimate segment in length. 



The radials are somewhat over twice as broad as long with a blunt median tubercle. 

 The elements of the IBr series are rounded, but not very convex, with no trace of a 

 median keel or tubercle. The IIBr series are 2, similar to the IBr series, but with the 

 component ossicles relatively somewhat longer. 



The 13 arms in the type specimen are 80 mm. long, or one- third again as long as 



the cirri. 



Syzygies occur between brachials 3 + 4, again from between brachials 9 + 10 to 

 between brachials 15 + 16, and distally at intervals of from 3 to 6 (usually about 5) 

 muscular articulations. 



P, is one-third shorter than P 2 , stout basally and tapering rapidly to a point, 

 with 9 segments. P 2 is 7 mm. long with 12 segments. The following pinnules decrease 

 very slightly in length, then increase slightly again distally. The terminal pinnules 

 extend for 1.5 mm. or 2 mm. beyond the tip of the arm. 



Notes. The description given above is from the type specimen from Albatross 

 station 4936. The specimen from the Formosa Strait in 64 meters was described as a 

 new species, Asterometra lepida, in the following terms: 



The centrodorsal is rounded-conical, about as long as broad at the base, with the 

 cirrus sockets arranged in 10 crowded, but regular, columns of usually 2 each, two 

 columns to each radial area. The cirri are lacking, but as the centrodorsal and the 

 cirrus sockets are proportionately smaller than in the three other species of the genus 

 (macropoda, longicirra, and anthus) it may be inferred that the cirri are either shorter, 

 or more slender, or both. The disk is lacking. The brachial and pinnule ambulacra 

 are protected by large covering-plates as in the other species of the genus. The 

 radials are short, about four times as broad as long, with a prominent tubercle hi the 

 midradial line. The IBr, arc oblong, approximately three times as broad as long. 

 The IBr 2 (axillaries) are broadly pentagonal, not quite twice as broad as long. The 

 IIBr series are 2. The 11 arms are 70 mm. long, resembling those of the other species 

 of the genus but somewhat more slender basally. PI is 5.5 mm. long, styliform, with 

 10 segments of which the first is not quite so long as broad, the second is slightly 

 longer than broad, and the third and following are slightly longer than the second. 

 P 2 Ts 6.5 mm. long with 12 segments resembling P! and of the same diameter basally 

 though, on account of its greater length, tapering more gradually. P 3 is similar to 



