A MONOGRAPH OF THE EXISTING CRINOIDS 111 



the edge of this eversion is thickened and smooth. The lateral portions of the distal 

 border of the IBrj are also everted, but not nearly so prominently as the proximal 

 border. The IB^ are verly slightly longer than those in the Challenger specimens, 

 and the distal border is not quite so much incised; this undoubtedly is due to the smaller 

 size of these individuals. 



The IBr 2 (axillaries) are not quite twice as broad as long; the proximal edge is 

 slightly straighter than in the Challenger specimens, and is slightly everted. The 

 lateral borders of the elements of the IBr scries and of the first brachials, and the inner 

 borders of the first two brachials, are laterally produced. 



PI is greatly enlarged with 12 or 13 segments of which the first eight or nine are 

 sharply flattened on the outside, the ventral border being somewhat produced; the 

 second and third segments are strongly carinate on the inner ventral border, especially 

 the third, but from this point on the carination rapidly diminishes in extent, disappear- 

 ing three or four segments later. On the second segment this carination is parallel to the 

 dorsoventral plane, but it gradually becomes recumbent so that on the fourth it is at 

 right angles to this plane. 



The brachials beyond the tenth are triangular, about as long as broad, with very 

 finaly spinous distal margins. The dorsal line of the arms is smooth in profile. 



A specimen from Albatross station 5256 was described as a new species under the 

 name of Crotalometra eupedata in the following terms. 



The centrodorsal is large and conical, 5 mm. broad at the base and 5 mm. high, with 

 the bare polar area forming the apex of the cone. The cirrus sockets are arranged in 

 10 columns of one or two each, which are usually succeeded by one or two obsolete 

 and more or less obliterated ones. The columns are on the outer borders of the radial 

 areas so that the columns of adjacent radial areas are in close apposition while the 

 two columns in each area are separated by a median space which is about equal to 

 their own width. 



The cirri are X-XX, 66, 90 mm. in length. The first 3 segments are two and 

 one-half times as broad as long, the fourth is twice as broad as long, the fifth is half again 

 as broad as long, and the sixth is slightly longer than broad. The seventh is a transition 

 segment, dull in the proximal three-fourths but highly polished and laterally compressed 

 in the distal fourth, not quite twice as long as broad. The eighth-eleventh or -twelfth 

 segments are about twice as long as broad, and those following gradually decrease in 

 length, becoming about as long as broad at about the twentieth, and twice as broad 

 as long distally. After the fifteenth the distal dorsal edge of the segments begins to 

 project slightly, though this is scarcely noticeable until the twentieth is reached, after 

 which it increases in height, becoming more sharply rounded in end view and arising 

 from the whole dorsal surface of the segment, so that the dorsal profile of the terminal 

 third of the cirri is strongly serrate. The opposing spine is a blunt tubercle with the 

 apex subterminal, arising from the entire dorsal surface of the penultimate segment. 

 The terminal claw is very long and slender, twice as long as the penultimate segment, 

 and only slightly curved. All of the cirrus segments have the distal ends all around 

 slightly projecting and very finely spinous, making the cirri rough to the touch. This 

 projection is slightly more marked on the ventral side than laterally. 



The disk is covered with small plates which are very thickly set near the ambulacral 

 grooves but become more scattered toward the periphery in the interambulacral areas. 



