A MONOGRAPH OF THE EXISTING CRINOIDS 189 



face, at the ninth segment becoming median and beginning to become slightly concave 

 in profile, and after the fourteenth resolving itself into two prominent entirely distinct 

 tubercles situated side by side, the distance between the apices of these tubercles being 

 about equal to the distance from either apex to the lateral border of the segments. 

 Distally these tubercles gradually move toward each other, at the same time moving 

 nearer and nearer the proximal margin of the segments. On the fourth segment before 

 the penultimate the tubercles merge into a single transversely elongate tubercle which 

 becomes less and less elongate, and on the antepenultimate becomes a single small 

 tubercle situated near the proximal margin of the segment. As a whole the cirri are 

 moderately stout. Although the dorsal profde is serrate, in lateral view no distinct 

 dorsal processes are seen except in the distal half, where the tubercles appear as minute 

 dorsal processes. 



The 10 arms are 75 mm. long and resemble those of the other large species of the 

 genus. 



Pi is 5 mm. long, small and weak, tapering with moderate rapidity in the proximal 

 half and becoming very slender in the distal half, composed of 14 segments of which 

 the first is short and those following gradually increase in length, becoming about as 

 long as broad on the fourth and fifth and distally about twice as long as broad. The 

 pinnule is slightly prismatic. P2 is 9 mm. long with 17 segments, not greatly larger 

 than P, basally but tapering evenly from the base to the tip ; the first two segments are 

 slightly broader than those following, much broader than long, the third is slightly 

 broader than long, the fourth is slightly longer than broad, and the following are about 

 half again as long as broad, becoming twice as long as broad toward the end of the 

 pinnule; the pinnule is rounded prismatic; the fourth and following segments have 

 slightly produced and spinous distal ends, this feature gradually increasing in extent 

 distally and being most marked at the prismatic angles. P3 is 6 mm. long with 14 

 segments, similar to Pj but very slightly smaller. P4 is 5 mm. long with 13 segments, 

 similar to P3 but slightly smaller. P5 is 4.5 mm. long with 14 segments, resembling 

 P4 but with proportionately shorter segments. Pj is 4 mm. long with 15 segments, 

 resembling Ps but with proportionately shorter segments. The following pinnules 

 are similar to Pe. The distal pinnules are very slender, 7 mm. long with 21 segments 

 of which the longest are about twice as long as broad. 



The color in alcohol is light yellowish, banded with purple at the brachial 

 articulations. 



A^o^es.— Another specimen from the type locality has the arms 75 mm. long and 

 the cirri XIV, 23-25, 11 mm. long. As in the type specimen, the first cirrus segment 

 is strongly compressed laterally through crowding by those on either side. Pi is 6 mm. 

 long with 15 segments. P2 is 9 mm. long with 17 segments. P3 is 6.5 mm. long with 

 14 segments. P« is 5 mm. long with 12 segments. Ps is 4.5 mm. long with 13 segments. 



The two other specimens from the type locality are similar to these. 



The specimens from Hong Kong have 20-22 cirrus segments. 



The specimen from Albatross station 5139 has the arms 57 mm. long. It agrees 

 with one of those from the type locality in having the cirrus segments somewhat 

 longer than usual, and more like those of D. mollis. 



Of the two specimens from Singapore the larger has the arms 55 mm. long and 

 the smaller has the arms 30 mm. long. 



