A MONOGRAPH OP THE EXISTING CRINOIDS 569 



The disk is 32 mm. in diameter. The anal tube is 6 mm. high. 

 In the first specimen from Bock's station 38 the centrodorsal is 11 mm. in basal 

 diameter with the slightly concave dorsal pole 7.5 mm. across. The cirri are arranged 

 in 2 or 3 rows. 



The cirri are about LXX, 18-23, from 12 to 21 mm. in length. The cirri are 

 very diversified, some being slender, straight, and weak, and others stout, thick, and 

 strongly curved. In the slender and straight cirri the first segment is short, the second- 

 third or -fourth are about as long as broad or a little longer, and the fifth-eighth are 

 about twice as long as broad. From about the tenth segment onward they are twice 

 as broad as long. In the large stout cirri the longest segments are only one-quarter 

 again as long as broad. A dorsal transverse ridge or knot occurs from the twelfth 

 or sixteenth segment onward. The terminal claw is rather stout, and is somewhat 

 longer than the penultimate segment. 



The radials and the IBri are concealed by the centrodorsal. The IBr 2 (axillaries) 

 are twice as broad as long, triangular, with the distal angle very acute and separating 

 the very short inner ends of the IIBr^ The IIBr, IIIBr, and IVBr series are all 

 4 (3 + 4). The first elements of the 2 last are interiorly united. The division series 

 are closely appressed so that from the dorsal side only the first 6 segments of P D are 

 visible. 



The 50 arms are from 110 to 130 mm. long. The brachials from the fourth to 

 about the seventieth have the distal ends overlapping and armed with small spines, 

 but the division series, first 3 brachials, and arm tips are smooth. There are 20-21 

 brachials to 10 mm., or 15-16 if the syzygial pairs are counted as units. The IIBr 

 series are 4 mm. in diameter. The first brachial is 2.3 mm. broad; 50 mm. from the 

 base the arm is 1.3 mm. broad. 



Syzygies occur between brachials 3 + 4, 17 + 18,23 + 24, or brachials 3 + 4, 14+15, 

 18+19, etc., and distally at intervals of 4 muscular articulations. 



P D is about 25 mm. long with about 60 segments, bearing a comb with 8-16 

 weak teeth, the last 2-5 segments being smooth. The basal segments are angular and 

 a little beadlike. The pinnule on the IIIBr series is similar, but somewhat shorter. 

 The pinnule on the IVBr series, or PI is about 20 mm. long and bears a comb con- 

 sisting of 11 teeth. P 2 is still shorter, and bears a comb with 8 rudimentary teeth. 

 P 3 is 6.5 mm. long, and is without a comb. The genital pinnules are 11 or 12 mm. 

 long. The distal pinnules are of about the same length. On all the pinnules the 

 second-fifth or -seventh segments have small processes. 



The disk is 30 mm. in diameter, and is without granules. The mouth is marginal. 

 The anal tube is subcentral and is 7 mm. high. 



The other specimen from Bock's station 38 has the centrodorsal 10 mm. in basal 

 diameter with the dorsal pole slightly concave, 6.5 mm. in diameter. 



The cirri are LXV, 22-24, from 12 to 25 mm. in length. 



The IBr, are ten times as broad as long. The IBr 2 (axillaries) are twice as broad 

 as long. The IIBr, IIIBr, and IVBr series are 4 (3 + 4), 2 of the last being present. 



The 42 arms are from 125 to 155 mm. long. 



The disk is 32 mm. in diameter, and the anal tube is 8 mm. high. 

 9729831 37 



