A MONOGRAPH OF THE EXISTING CRINOIDB 129 



Of the five specimens from south of the Goto Islands one has 38 arms 180 mm. 

 long; there are several slender cirri with no expansion of the ends of the segments. 

 Another has 34 arms 135 mm. long; the lateral borders of the division series have 

 rather numerous fine tubercles. The cirri are XLV, 19-20 (usually 20), about 30 mm. 

 long. Among the cirri there is a single one 18 mm. long with 18 segments that is 

 slenderer than the others, scarcely at all curved, in which the component segments do 

 not have expanded ends. The centrodorsal is 6 mm. in diameter, with the dorsal 

 pole slightly concave. A third specimen has 33 arms 135 mm. long. All the division 

 series are 2. The second and third segments of the first seven or eight pinnules bear 

 a very high carinate process, and the fourth and sometimes the fifth carry a much 

 smaller carinate process. The lateral edges of the elements of the division series have 

 a few small tubercles. The centrodorsal is discoidal with the broad dorsal pole slightly 

 concave, 5 mm. in diameter. The cirri are XXXIII, 19-23 (usually 22). Another 

 example has about 30 arms 140 mm. long. The outer portion of the proximal and 

 distal edges of the elements of the division series are swollen and more or less beaded, 

 and the lateral edges bear small tubercles. The fifth specimen is small, with 25 arms. 



In the specimen from Mortensen's station 10 the cirri are XXX, 19-23, from 17 to 

 25 mm. long. The IIBr and IIIBr series are 2, the latter being externally developed. 

 The division series have well-developed ventrolateral tubercles, 1 to 3 on each segment. 

 The 29 arms are about 100 mm. long. There are 14 brachials to each 10 mm., or 13 if 

 the syzygial pairs are counted as units. The distal intersyzygial interval is 14-19 

 muscular articulations. P! is 7 mm. long, with about 30 segments. P a is 13 mm. long, 

 with 37 segments. P 3 is composed of 33 segments. P 4 is about 10 mm. long. The 

 distal pinnules are 11 mm. long, with about 25 segments. The disk is lacking. 



In one of the specimens from Mortensen's station 13 the cirri are XXXIII, 22-25, 

 from 20 to 30 mm. long. The centrodorsal is 8 mm. in diameter, with the concave 

 dorsal pole 7 mm. across. The 35 arms are 80+ mm. long. There are two IVBr 2 

 series. In another specimen from Mortensen's station 13 the cirri have 19-25 seg- 

 ments. There are 26+ (probably 30) arms 80 mm. long. The disk is incised, 8 mm. 

 in diameter with the anal tube 3 mm. high. In a third specimen two postradial series 

 bear six and four arms, the three other postradial series being broken away. In the 

 fourth specimen from station 13 the cirri have 19-21 segments. There are 22 arms 

 90+ mm. long. 



In the specimen from Mortensen's station 24 the cirri are XXX, 22-25, from 21 to 

 27 mm. long. The 26 arms are 110 mm. long. The distal intersyzygial interval is 

 4-11 (usually 8) muscular articulations. P! is 8 mm. long, with 25 segments. P 3 is 

 11 mm. long, with 33 segments. P 6 is 10 mm. long, with 24 segments. The distal 

 pinnules are 9 mm. long, with 22 segments. The first 10 pinnules have the usual 

 characteristic processes on the proximal segments. The disk, which is detached, is 

 incised and measures 12 mm. in its longest and 8 mm. in its shortest diameter. The 

 perisome contains calcareous granules. 



The species is represented from Mortensen's station 26 by detached arms and 

 groups of arms. The arm length is 125 mm. 



The specimen from Bock's station 46 is young, with 12 arms 35-40 mm. long. 

 The arms are slender, and the brachials are smooth, rather long, and slightly constricted 

 centrally. The arm bases are well separated, leaving broad strips of the perisome 



