A MONOGRAPH OF THE EXISTING CRINOIDS 447 



65 mm. long. (6) The cirri are 35-45 mm. long; there are 10 arms, all broken. (7) 

 The cirri are 45-55 mm. long, and the 10 arms are 55 mm. long. (8) The cirri are 

 35-50 mm. long; the 10 arms are all broken. (9) The cirri are 45-50 mm. long; the 

 12 arms are 55 mm. long. (10) The cirri are 45-50 mm. long, and the 12 arms are 

 70 mm. long. (11) The cirri are 40-50 mm. long, and the 10 arms are 65 mm. long. 

 (12) The cirri have up to 75 segments and are 50-60 mm. long; the 11 arms are 70 

 mm. long. (13) The cirri are 50 mm. long; the 10 arms are broken. (14) The cirri 

 and the 10 arms are broken. 



In the specimen collected by Capt. H. Christiansen south of the Goto Islands 

 the arms are 58 mm. long and the cirri are XII, 50-56, 35-45 mm. long. 



In a specimen from Bock's station 45, according to Gislen, the cirri are XI, 

 27-34, 7-10 mm. long. The fifth-seventh cirrus segments are half again as long as 

 broad, and the distal segments are as long as broad; a short dorsal spine is developed 

 from the tenth segment onward. The basals project interradially as small promi- 

 nences. The radials are half again as long as broad, in lateral apposition, with a 

 strong longitudinal crest ending proximally in a blunt spine. The IBr, are twice as 

 broad as long. There is a slight synarthrial carination. The 10 arms are 15 mm. 

 long, "wall-sided," with small lateral crests as far as the second brachials. The entire 

 arm has 40 bracbials, which develop a dorsal spine from the twenty-fifth onward. 

 The distal mtersyzygial interval is 5 muscular articulations. PI is 2.3 mm. long with 

 7 segments. P 2 is 2 mm. long with 7 segments. P 3 is 9 mm. long. The distal pinnules 

 are 5 mm. long with 13 segments which have small spiny whorls on the distal ends; 

 the third and fourth segments are three times as long as broad. 



In another specimen from Bock's station 45 the cirri are XII, 26-36, 7-11 mm. 

 long. The 10 arms are 18 mm. long; the distal intersyzygial interval is 4 muscular 

 articulations. P, is 2.3 mm. long with 8 segments. P 2 has 8 segments. The distal 

 pinnules are 5 mm. long with 13 segments. 



A third specimen from station 45 has the cirri XVI, 23-32, 5-10 mm. long. The 

 10 arms are 15 mm. long. PI is 2.5 mm. long with 9 segments. P 2 is 2.1 mm. long 

 with 8 segments. P 3 is 3.2 mm. long with 10 segments. 



In a fourth specimen from station 45 the cirri have 13-20 segments which are 

 from half again to twice as long as broad. Small orals are present. The 10 arms are 

 12 mm. long. The pinnulation is complete. 



Another specimen from station 45 has the cirri XIV, 12-26, 2-5 mm. long. 

 Large and well -developed orals are present covering one-third the radius of the disk. 

 The 10 arms are 8 mm. long. P 2 is absent. P, is 1.7 mm. long with 7 segments. 



In a specimen from Bock's station 46 the centrodorsal is 3 mm. broad at the 

 base and 3 mm. high. The cirri are XXII, up to 80, 45 mm. long, most of them 

 broken or very small. From the seventh segment onward there is a dorsal crest that 

 is gradually transformed into a dorsal spine. The radials are from two to three 

 times as broad as long, with a smaU dorsal tubercle. The basals are visible in the 

 interradial angles. The 16 arms are 70 mm. long. The brachials from about the 

 fifty-fifth develop dorsal spines which are strongly curved and slowly increase hi size. 

 P! has 12 segments. P 2 is larger than PI and has 13 segments. P 3 has 12 segments. 

 The distal pinnules are 10-11 mm. long with 16 segments. 

 A young individual from station 46 has the centrodorsal 1 mm. high. The cirri 



