A MONOGRAPH OF THE EXISTING CRINOIDS 455 



high. The cirrus sockets are arranged in five groups, 3-5 in each group. The cirri 

 are XX, all lost. The ra dials are five times as broad as long. The J 2 arms are 100 mrn. 

 long; they are sharply flattened laterally as far as the fourth brachial. The brachials 

 develop a dorsal spine from about the fifty-fifth onward. One postradial series bears 

 two IIBr 2 series. The distal intersyzygial interval is 6-7 muscular articulations. 

 PI is 7 mm. long with 13 segments. P 2 is 9.5 mm. long with 14 segments. P 3 is 8 mm. 

 long with 12 segments. The distal pinnules are 12+ mm. long. 



In a specimen from station 59 the centrodorsal is a pointed cone. The cirri are 



XVII, 65-83, 38-68 mm. long. The radials are three times as broad as long with a 

 dorsal crest. The 10 arms are 85 mm. long. The brachials develop a dorsal spine 

 from about the fifty-fifth. The distal intersyzygial interval is (3-)5-6 muscular 

 articulations. The distal pinnules are 11.5 mm. long with 19 segments which are two 

 and one-half tunes as long as broad. 



A specimen from station 59 has the centrodorsal 3.5 mm. high. The cirri are 

 XXII, 72-82, 55-73 mm. long. The radials are from three to four times as broad 

 as long, with a dorsal crest. The 10 arms are 105 mm. long. The brachials develop 

 a dorsal spine from the fifty-fifth onward. The distal intersyz3 T gial interval is 6 

 muscular articulations. The distal pinnules are 15 mm. long with 22 segments 

 which are from two and one-half to three times as long as broad. 



A specimen from station 59 has the cirri XIX, 75-86, 38-63 mm. long. The 10 

 arms are 85 mm. long. The brachials develop a dorsal spine, which increases slowly 

 in height, from about the fortieth. The distal intersyzygial interval is 5-6 muscular 

 articulations. The distal pinnules are 11 mm. long with 17 segments which are two 

 and one-half times as long as broad. 



In another specimen from station 59 the centrodorsal is sharply conical, 2.5 

 mm. high. The cirri are XXI, 55-75, 30-57 mm. long. The radials are four times 

 as broad as long, with a dorsal tubercle. The 10 arms are 75 mm. long. The dorsal 

 spines first appear at about the seventy-fifth brachial, and are rather low. The 

 distal intersyzygial interval is 6-7 (-17) muscular articulations. P, is 5 mm. long 

 with 10 segments. P 2 is 5.5 mm. long with 12 segments. P 3 is 6 mm. long with 

 10 segments. P 4 is 6.5 mm. long with 12 segments. The distal pinnules are 11 mm. 

 long with 20 segments which are from twice to two and one-half times as long as broad. 



Other specimens from station 59 have the following characters: The cirri are 



XVIII, 56-76, 32-57 mm. long. The radials are three times as broad as long, with 

 a slight tubercle. The 11 arms are 65 mm. long. The brachials develop a dorsal 

 spine on the fiftieth. The distal intersyzygial interval is 4-6 muscular articulations. 

 PI is 5 mm. long. P 2 is 5.7 mm. long with 11 segments. P 3 is 6 mm. long with 10 

 segments. The distal pinnules are 10.5 mm. long with 19 segments which are twice 

 as long as broad. The centrodorsal is cylindrical, 3 mm. high, with the dorsal pole 

 rounded and showing a small depression. The cirri are XXIII, 68-77, 45-60 mm. 

 long. The radials are six times as broad as long with a dorsal crest. There is a 

 slight carination on the ossicles of the IBr series. The 10 arms are 70 mm. long. 

 The dorsal spines on the brachials, which are rather weak, are developed from about 

 the fiftieth onward. The distal intersyzygial interval is 5-7 muscular articulations. 

 The distal pinnules are about 10 mm. long composed of segments which are twice 

 as long as broad. The cirri are XVIII, 70-100, 55-70 mm. long. The radials are 



