A MONOGRAPH OF THE EXISTING CRINOIDS 271 



each 10 mm., or 15 if the syzygial pairs are counted as units. The width of the 

 brachials is 0.5 mm. The arm bases are fairly smooth. 



Syzygies occur between brachials 3 + 4, 11 + 12, and 15 + 16, and distally at 

 intervals of 3 muscular articulations. 



PI is 4 mm. long with 27 segments. P 2 is 3.5 mm. long with 23 segments. PI 

 and P 2 bear combs of 8-10 teeth. P 3 is 2.5 mm. long with 11 segments, without a 

 comb, but with a gonad. The distal pinnules are 4.5 mm. long with 14 segments. 

 The second-fourth pinnule segments are somewhat notched on the outer sides, 

 especially on P! and P 2 . The bases of the pinnules, however, are smooth, because 

 of enveloping perisome. 



The disk is smooth, about 2 mm. in diameter. The mouth is central. There 

 are cushionlike swellings along the ambulacral furrows. The anal cone is broad, 

 stout and short. 



In another specimen from Bock's station 45 the cirri are XVI, 10, 3.5 mm. long. 

 The 10 arms are about 30 mm. long. P! and P 2 bear combs with 8-10 teeth. P 3 

 to P 12 bear gonads. 



Another specimen from Bock's station 45 has the cirri XIX, 9-10, from 2.5 mm. to 

 3 mm. in length. The 10 arms are 15 mm. long. P 2 is very small. The disk is 

 2 mm. in diameter. 



Another specimen from Bock's station 45 has the cirri XVI, 9, 3.5 mm. long. 

 The IBri is five times as broad as long. The 10 arms are 20 mm. long. P! and P 2 

 bear combs, and P 3 to P 9 bear gonads. 



In another example from Bock's station 45 the cirri are XIV, 10, 3.5 mm. long. 

 The combs on P t and P 2 have 8-10 teeth. The disk is 3 mm. in diameter. 



Another specimen from Bock's station 45 has the cirri XVI, 10-12, from 4 to 

 4.5 mm. in length. P! and P 2 bear combs. The disk is 3 mm. in diameter. 



Another example from Bock's station 45 has the cirri XVII, 8-9, from 2 to 3 mm. 

 in length. In the smallest cirrus the antepenultimate segment is half again as long 

 as broad. The IBri is turned outward almost at a right angle. The 10 arms are 25 

 mm. long. PI and P 2 bear combs. The disk is 2 mm. in diameter. 



Another individual from Bock's station 45 has the cirri XIII, 9-10, from 2 mm. 

 to 3 mm. long. The 10 arms are 25 mm. in length. PI is 3.5 mm. long and P 2 is 2 

 mm. long, both bearing combs. The distal pinnules are 3.5 mm. long with 12 

 segments. 



In another specimen from Bock's station 45 the cirri are XVI, 8-9; the 10 arms 

 are 20 mm. long. P! and P 2 bear combs, that on P! having 7 teeth. 



The last specimen from Bock's station 45 has the cirri XV, 9-10, 3 mm. long. 

 The IBri is four times as broad as long. The IBr 2 (axillary) is half again as broad as 

 long. The 10 arms are about 20 mm. long. PI and P 2 bear combs, that on PI 

 consisting of 8 teeth. The disk is 2 mm. in diameter. 



The specimen from Bock's station 42 has the cirri XVI, 10-12, 4 mm. long. The 

 IBr! are almost completely concealed by the centred orsal. The IBr 2 (axillaries) are 

 twice as broad as long. P! is 4 mm. long with 23 segments, of which 8 bear teeth. 

 P 2 bears a comb. The distal pinnules are 3 mm. long with 13 segments. The disk 

 has been thrown of! so that the basal star is visible. 



