A MONOGRAPH OF THE EXISTING CRINOIDS 453 



mm. long with 9 segments. P 3 is 4 mm. long with 10 segments. The distal pinnules 

 are 7 mm. long with 16 segments. 



la a specimen from Bock's station 57 the cirri are XV, 17-32, 4-10 mm. long. 

 Tho radials are as long as broad. The elements of the IBr series are rather smooth. 

 The 10 arms are 12 mm. long. P[ is 2.5 mm. long with 8 segments. P 2 is absent. 

 P 3 is 2.8 mm. long with 10 segments. The distal pinnules are 4 mm. long with 14 

 segments which are twice as long as broad. The disk is 1.8 mm. in diameter. The 

 orals have been resorbed. 



In a specimen from Bock's station 59 the centrodorsal is sharply conical, 3 

 mm. high. The cirri are XVII, 77-90, 45-65 mm. long. From the third to the seventh 

 (or fifteenth) the cirrus segments bear a dorsal spine; after these there are usually 

 some smooth segments. The ninth- twenty-fifth segments are longer than broad. 

 All the distal segments have dorsal spines. The opposing spine is usually not longer 

 than the spines on the segments preceding. The radials are three tunes as broad as 

 long. The 10 arms are 95 mm. long, they are laterally flattened as far as the eighth 

 brachials. The dorsal spine is developed from the sixtieth brachial onward. The 

 distal intersyzygial interval is 4-6 muscular articulations. PI is 7 mm. long with 12 

 segments. P 2 is 8 mm. long with 12 segments. P 3 is 7.5 mm. long with 9 segments. 

 The distal pinnules are 11 mm. long with 16 segments. The color hi alcohol is red- 

 brown. 



In a specimen from Bock's station 59 the cirri are XIX, 56-75, 40-50 mm. long. 

 More often than in the specimen just preceding there are weak spines before the oppos- 

 ing spine. The radials are three times as broad as long, with a dorsal crest. The 11 

 arms are 75 mm. long. The brachials from the fiftieth to sixtieth onward develop 

 a dorsal spine that rises to a height of one-third the width of the brachial. The distal 

 intersyzygial interval is 6-7 muscular articulations. P] is 5.5 mm. long with 12 seg- 

 ments. P 2 is 6.5 mm. long with 11 segments. P 8 is 5 mm. long with 7-9 segments. 

 The distal pinnules are 11 mm. long with 18 segments which are two and one-half 

 tunes as long as broad. 



In another specimen from station 59 the centrodorsal is 2.5 mm. high. The 

 cirri are XVII, 65-85, 45-60 mm. long. There is no dorsal spine before the twentieth 

 (or twenty-fifth) cirrus segment. The 11 arms are 85 mm. long. The brachials from 

 about the sixty-fifth onward develop dorsal spines that rise to a height of about one- 

 fifth the width of the brachial. The distal intersyzygial interval is 4-6 muscular 

 articulations. P! is 6.5 mm. long with 14 segments. P 2 is 8.5 mm. long with 14 

 segments. P 3 is 8 mm. long with 13 segments. The distal pinnules are 12.5 mm. 

 long with 22 segments. 



Another specimen from station 59 has the cirri XVIII, 65-85, 40-65 mm. long. 

 The radials are two and one-half tunes as broad as long. The 10 arms are 85 mm. 

 long. From about the fiftieth brachial onward dorsal spines are developed which 

 resemble those of the specimen preceding. The distal intcrsyzygial interval is 5-10 

 muscular articulations. PI is 5.5 mm. long with 11 segments. P 2 is 6 nun. long 

 with 11 segments. P 3 is 6 mm. long with 11 segments. The distal pinnules are 13 

 mm. long with 20 segments. 



In another specimen from station 59 the centrodorsal is rather bluntly conical, 

 2 mm. high. The cirri are XX, 65-80, 40-55 mm. long. The radials have a very 



