A MONOGRAPH OF THE EXISTING CRINOIDS 115 



The larger specimen from Siboga Station 89 has 22 arms 80 mm. long; the smaller, 

 which is imdergoing adolescent autotomy, has 21 arms. 



The example from Siboga Station 213 is typical, with 20 arms 90 mm. long. 



The specimen from New Caledonia has 19 arms; the cirri are XIX, 17-18. 



The specimen recorded by Hartlaub (as pulchella) from Ruk, which I examined 

 at Hamburg, has 20 arms; the cirri are XXIII, 15-17. As described by Hartlaub 

 the centrodorsal is flat and thick discoidal with a circular circumference. The cirri 

 are arranged in 2 irregular rows, and in part are not entirely confined to the margin. 

 The fourth, fifth, and sixth cirrus segments are elongated. The segments in the 

 distal half of the cirri are shorter, moderately high, and bear small dorsal spines. 

 The opposing spine is not distinguished from the others by greater stoutness. The 

 radials are partially visible. The IBri are short and are free laterally. The IBr2 

 (axillaries) are triangular with a sharp distal angle. The IIBr series are 2, and the 

 IIBri are only slightly united. 



The 2 first brachials are very short, and are united by syzygy; the first are only 

 for a short distance in contact ^vith their fellows. The succeeding 3 or 4 brachials 

 are irregularly discoidal and show a tendency to develop articular tubercles on the 

 articulations. Toward the ends of the arms the segments become almost oblong. 

 The first syzygy is between brachials 1+2, the second from between brachials 12 + 13 

 to between brachials 14 + 15, and those succeeding occur at intervals of usually 4 

 muscular articulations. P, is up to 10 mm. in length, slender and dehcate, with a 

 prominently marked comb. P2 is markedly shorter, and the pinnules following 

 gradually decrease in length to those of the eighth, tenth, and twelfth brachials, 

 which are approximately of the same size, then increase, reaching a length of about 

 6 mm. On some arms the seventh brachial bears a very small pinnule. Combs occur 

 as far as the pinnule of the tenth brachial. The disk is naked, 7 mm. in diameter; 

 the mouth is radial. 



The specimen from Bock's Station 53 which was identified as this species by 

 Gislen has 10 arms 40+ mm. long. The cirri are XXIII, the peripheral with 17-18, 

 the dorsal with 1 5-1 6 segments ; the length of the cirri is from 7 to 9 mm. The fourth 

 and fifth cirrus segments are the longest, twice as long as broad. From the fifth 

 onward a dorsal transverse ridge is developed. The IBrj (axillaries) are twice as 

 broad as long. The first bracliials are free ulteriorly. The intersyzygial interval 

 is 5 or 6 muscular articulations. The first 4 pinnules bear combs. P, is 5 mm. long 

 with 30 segments of which 18 bear teeth; P2 is a httle shorter, and about 13 of its 

 segments carry teeth; P3 and P4 have still shorter combs; P5 is 3 mm. long with 11 

 segments. The distal pinnules are 5 nun. long with 13 segments. The disk is 5 mm. 

 in diameter; the mouth is subcentral. The arm bases are tolerably smooth, and the 

 synarthrial tubercles are obsolete. The arms are rather stout. The distal brachials 

 are shghtly overlapping with spinous, but not everted, distal ends. 



One of the specimens from Bock's Station 59 has the centrodorsal 3.5 mm. in 

 diameter and the bare dorsal pole 2.5 mm. across. The cirri are XXI, 19, from 10 

 to 12 mm. in length. The first and second segments are short, the third is about 

 as long as broad and shghtly constricted centrally, the fourth is a little longer, and 

 the fifth-seventh are the longest, half again as long as broad. The following shorter 



