A MONOGRAPH OF THE EXISTING CRINOIDS 523 



In 1 of the 3 specimens from Bock's station 45 as described by Gisl6n the dorsal 

 pole of the centrodorsal is 4 mm. in diameter. The cirri are arranged in 2 rows. 



The cirri are XXVII, 23-27, from 25 to 30 min. in length. The longer ventral 

 cirri have 25-27 segments, and the shorter dorsal have 23-25 segments. 



The radials are visible in the angles of the calyx. The IBr, are four times as 

 broad as long, and are in contact in the proximal half but free in the distal half. 

 The IBr 2 (axillaries) are low pentagonal, half again as broad as long. The 2 elements 

 of the IBr series are united by synarthry. The IIBr series (9 present) are 4 (3 + 4). 

 The IIIBr series (13 present) are 2. The IVBr series (3 present) are 4(?). The 

 IIB^ are almost wholly united interiorly. There is a synarthrial tubercle on the 

 IIBr series and another on the IIIBr series. 



The arms are 35+ (probably originally 39) in number, 125 mm. long. The 

 width of the arm proximally is 2.2 mm. and in the middle 1.7 mm. The arm bases 

 in this and the following specimen are smoother than in the specimen from station 

 51. 



P D is 16 mm. long with about 40 segments, of which the terminal 7 bear teeth. 

 The pinnule on the IVBr series is 15 mm. long with about 38 segments, of which 

 the last 7 bear teeth. PI is 5 mm. long with about 25 segments, of which the last 

 6 bear teeth. P 2 is 3 mm. long with 18 segments. The pinnules following become 

 longer. The distal pinnules are 7 mm. long with 18 segments. Combs occur at 

 intervals to at least the twenty-fifth pinnule. 



The disk is 18 mm. in diameter. The anal interradius is large and swollen and 

 bears calcareous papillae. The color as preserved is grayish yellow. 



In another specimen from Bock's station 45 the cirri are XX, 19-27, from 12 

 to 25 mm. long. The long ventral cirri have 26-27 segments, and the short dorsal 

 have 19-20 segments. The IIBr series are 4 (3 + 4) (9 present). The IIIBr and IVBr 

 series are 2, and there is present also a single VBr 2 series. The 47 arms are 105 

 mm. long. P D is from 11 to 13 mm. long with 24-37 segments, of which the terminal 

 6 or 7 bear teeth. PI is from 5 to 9 mm. long with 20-35 segments. P 2 and P 3 are 

 very short, from 4 to 6 mm. long. The distal pinnules are 6 mm. long with 16-18 

 segments. Combs occur at intervals to the twenty-fifth or thirtieth pinnule. The 

 disk is 14 mm. in diameter. The anal interradius bears coarse and large calcareous 

 plates. 



In this specimen the division series beyond the IIIBr series are developed 

 externally in reference to the IIBr series, the inner face of the axillaries bearing an 

 undivided arm. The arm branching, therefore, resembles superficially that of 

 Comatella and not that of the species of Comaster, in which division series and 

 undivided arms alternate in relative position on successive axillaries. 



In the third specimen from Bock's station 45 the centrodorsal is finely pitted; 

 it is 2.5 mm. in diameter, with the free dorsal pole 1.5 mm. in diameter. The cirri 

 are XVII, 15-20, from 10 to 19 mm. long. The sixth-eighth cirrus segments are 

 the longest, half again as long as broad. The ninth is a transition segment. The 

 opposing spine reaches from one-fourth to one-third the width of the penultimate 

 segment in height. 



