A MONOGRAPH OF THE EXISTING CRINOIDS 469 



segment bearing it. The terminal claw is short and stout, and is equal in length to 

 the penultimate segment. 



The radials are visible as narrow bands beyond the run of the centrodorsal. The 

 IBri are four times as broad as long and in lateral apposition. The IBr 2 (axillaries) 

 are low pentagonal, three times as broad as long, with concave distal margins. There 

 is a low synarthrial tubercle on the articulation between the elements of the IBr 

 series. The IIBr and IIIBr series are 2, six of the latter being present, all developed 

 externally. The ossicles immediately following each axillary are united interiorly. 



The 26 arms are 120 mm. long. The width of the first brachials is 1.6-1.8 mm. 

 The second brachials are rectangular, twice as broad as long, and those following have 

 slightly oblique ends. The distal brachials are discoidal and short, from half again 

 to one-third again as broad as long. The lateral profile of the arms is rather smooth. 

 There are 17 or 18 brachials to each 10 mm. of the arm, or 16 if the syzygial pairs are 

 counted as units. The arms are very close to one another, the interspaces being chiefly 

 between the IBr axillaries to the fourth brachials on the outer side of the postradial 

 series. 



The first syzygy is usually between brachials 3+4, but there are often exceptions. 

 The distal intersyzygial interval is 7-12 muscular articulations. Gisl6n gave hi detail 

 the distribution of the syzygies on two arms arising from a IIIBr series and on the 

 adjacent arm arising from the same IIBr axillary. On the external arm from the 

 IIIBr axillary the syzygies are between brachials 8+9, 20+21, and 30+31; on the 

 inner arm arising from the same IIIBr axillary the syzygies are between brachials 

 8+9, 18+19, and 28+29. On the adjacent arm arising from the same IIBr axillary 

 the syzygies are between brachials 5+6, 21+22, 30+31, 41+42, 52+53, 65+66, 

 78+79, 90+91, 101 + 102, and 109 + 110. 



P! is 11 mm. long, with 18-21 segments, of which the fourth and following are 

 slender, half again to twice as long as broad, and, like the segments of the pinnules 

 following, smooth. P 2 is 11-18 mm. long, with 19-25 segments. P 3 is 14-16 mm. long 

 (in a single case only 8 mm. long), with 17-20 segments. P 4 is 10-13 mm. long, with 

 14-16 segments. P 8 is 6.5 mm. long, with 14 segments. The distal pinnules are 

 8.5-10.5 mm. long, with about 20 segments, which are twice as long as broad. The 

 disk is strongly incised, with the greatest diameter measuring 7 mm. and the least 5 

 mm. The soft parts do not cover the whole ventral surface of the division series. 

 The color is violet, with lighter and darker transverse bands on the arms. 



In one of the two specimens from Bock's station 47 the cirri are XXIII, 14-17, 

 from 5.5 to 7 mm. long. The smallest cirrus has only 11 segments and is 3.5 mm. long. 

 The fifth-seventh cirrus segments are the longest, half again as long as broad. There 

 are no dorsal spines, but the segments are laterally compressed, forming a very weak 

 dorsal keel. The height of the opposing spine equals from one-third to one-fourth 

 the width of the penultimate segment. The radials resemble those hi the specimen 

 described immediately above. The IBr t are three times as broad as long and have 

 slight lateral prominences. The IBr 2 (axillaries) are one-third again as broad as long 

 and are almost hexagonal because of the posteriorly directed median synarthrial 

 tubercle. The 10 arms are 27 mm. long. The first brachials are ulteriorly united 

 and are half as broad exteriorly with a convex outer margin an indistinct lateral 

 prominence. The brachials are smooth. The first syzygy is between brachials 3+4, 



