A MONOGRAPH OF THE EXISTING CRINOIDS 95 



The cirri are about XEK, about 20. The segments are subequal, short, the first 

 6 or 7 broader than long, and those following slowly increasing in length so that the 

 outeiTnost are a little longer than broad. The distal segments bear a slight transverse 

 ridge set with fine spines. The cirri are somewhat compressed laterally in their distal 

 portion. 



The radials are barely visible in the interradial angles of the calyx. The EBri 

 are laterally somewhat united, or entirely free. The IBrj (axillaries) are rather short 

 and pentagonal. On the middle of their articulation with the IBri there is a slight 

 elevation. Some of the axillaries and the first two brachials have traces of a slight 

 production of the outer border. 



The 10 arms are about 40 mm. long. They have a rather rough dorsal surface. 

 The 8 or 9 lowest brachials have fairly smooth articulations. On the middle of the 

 articulation between the first and second brachials there is a slight elevation. The 

 first brachial is short, approximately rhombic, and interiorly closely united with its 

 fellow. From the tenth onward the brachials are bluntly wedge-shaped, with their 

 distal ends somewhat produced and overlapping laterally on either side the bases of 

 the brachials succeeding. Toward the arm tips the brachials gradually become shorter 

 and finally more discoidal. 



The first syzygy is between brachials 3+4, the second is from between brachials 

 9 + 10 to between brachials 12 + 13 (usually between brachials 9 + 10), and the distal 

 intersyzygial interval is from 2 to 5, often 3 or 4, muscular articulations. Toward 

 the arm tips the intersyzygial interval rises to 5 or 6 muscular articulations. 



Pi tapers rapidly after the fii-st few basal segments, which show a tendency to 

 carination. The pinnule is two-thirds as long, or occasionally even quite as long, as 

 P2 and P3, which are less slender and taper more gradually. These pinnules, like Pi, 

 are composed of about 12 segments which are rather flat and broad. The length of 

 P2 and P3 reaches 5 mm. The three first pinnules on the inner side of the arms are 

 somewhat smaller than the corresponding pinnules on the outer side of the arms. 

 The length of the pinnules of the two following pairs (P4 and Pa and Ps and P.) de- 

 creases, the pinnules succeeding becoming longer again and reaching a length of about 

 5 mm. 



The disk has been lost. Sacculi are thickly set on the pinnules. 



The centrodorsal and cirri are uniform Ught brown, and the arms are the same 

 but with dark bands at the brachial articidations. 



Notes. — The preceding description is adapted from the original description of 

 Hartlaub. I examined Hartlaub's type specimen in the Berlin Museum in 1910. 

 The cirri are XXI, 21-23 (usually nearer the latter), 11 mm. long. The cirrus seg- 

 ments are subequal, the outer slightly broader than long. On the sixth a subterminal 

 transverse ridge appears which becomes median on the last one or two before the 

 penultimate. This transverse ridge is very low and inconspicuous, being most con- 

 picuous on the last two or three segments where it is very narrow and may become 

 reduced to a small tubercle. The opposing spine is subterminal, and leans slightly 

 anteriorly. It reaches in height about one-third the distal width of the penultimate 

 segment. 



One of the specimen from near Misaki has the cirri XXI, 22-29, 15 mm. long. 



