A MONOGRAPH OF THE EXISTING CRINOIDS 179 



with 9 segments. P a is 4.5 mm. long, with 10 segments. P 2 is 4.5 to 5 mm. long, 

 with 11 segments. The distal pinnules are 6.2 mm. long, with 18 segments, which 

 are three times as long as broad. The disk is 2 mm. in diameter. 



In another specimen from station 45 the centrodorsal is 1 mm. in diameter 

 with the free dorsal pole 0.5 mm. in diameter. The cirri are XIX, 13-15, from 4 to 

 6.5 mm. long. The arms are 35 mm. long. P c is 2 mm. long, with 7 or 8 segments. 

 P! is 2.5 mm. long, with 9 segments. P a is 3.5 mm. long, with 11 segments. The 

 third segment of P! and P tt is one-third again as long as broad. P b has 12 segments. 

 The distal pinnules are 6 mm. long, with 18 segments. The disk is 2 mm. in diameter. 



In a third specimen from station 45 the cirri are XVIII, 12-13, from 3.5 to 5 

 mm. long. The arms are 25 mm. long. P is 2.2 mm. long, with 9 segments. P t 

 is 2.4 mm. long, with 9 segments. P a is 3.3 mm. long, with 10 segments. P 2 is 3 

 mm. long, with 10 segments. P b is 3.2 mm. long, with 12 segments. P 3 is 3.2 mm. 

 long, with 13 segments. The disk is 2 mm. in diameter. 



In a fourth specimen from station 45 the cirri are about XX, 13-14, from 4 to 5 

 mm. long. The arms are 23 mm. long. The proximal border of the IBri is very 

 slightly everted. PC is 1.8 mm. long, with 6 or 7 segments. PI is 2.2 mm. long, 

 with 8 segments. P a is 3.2 mm. long, with 9 segments. P 2 is 2.7 mm. long, with 9 

 segments. P b is 3 mm. long, with 10 segments. P 3 is 3.5 mm. long, with 11 seg- 

 ments. P 2 and P 3 have rather serrate distal segments. The disk is 2 mm. in 

 diameter. This specimen, according to Gislen, is transitional between the larger 

 specimens and the very small ones from stations 45 and 53. 



In a small specimen from station 45 the cirri are XX, 11-12, from 2.5 to 3 mm. 

 long. The length of the third segment is one-fourth more than the width of the 

 expanded distal end. The fourth segment is twice as long as the distal width and 

 is strongly constricted centrally. The fifth and sixth segments are proxlmally a little 

 narrower. The segments from the seventh to the antepenultimate are half again as 

 long as broad and are laterally compressed. The opposing spine is sharp, its length 

 equaling about half the width of the penultimate segment. The terminal claw is 

 pointed, curved, and somewhat longer than the penultimate segment. The five arms 

 are about 20 mm. long. The radials are visible as a narrow band with a median promi- 

 nence; they are separated at the interradial angles by the basals. The IBri are 

 proximally everted with a median keel which in height, as viewed laterally, equals 

 one-third the thickness of the ossicle. There is a similar prominence on the distal 

 part of the IBr 2 and the first two brachials where laterally, however, it has no distinct 

 border. The ends of the segments are slightly everted. The brachials from the 

 eighth onward have oblique ends. Syzygies occur between brachials 3+4 and 13+14, 

 and distally at intervals of three (or four) muscular articulations. P c is 1.5 mm. 

 long with 6 segments. PI has 6 segments of which the second-fourth are half again 

 as long as broad. P a is 2 mm. long with 8 segments of which the third-fifth are 

 twice as long as broad. The distal ends of the pinnule segments are spiny and are 

 somewhat everted. The segments of the distal pinnules are very long, four or five 

 times as long as broad. The disk is 1 mm. in diameter. The anal tube is smooth 

 and subcentral. The mouth is subcentral. The sacculi are dark. The color in 

 alocohol is yellowish white. 



