154 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



P c is 4 mm. long, moderately stout, strongly prismatic, evenly tapering to the 

 tip, the distal border of the segments sharply, though narrowly, carinate, composed 

 of 11 segments. P t similar to P c , 4.5 mm. long, with 12 segments. P a is 11 mm. 

 long, with 17 segments, very slender like the succeeding pinnules, though very stiff. 

 The first two segments are slightly broader than long, the third and fourth half again 

 as long as broad, and the following gradually increase in length, becoming distally 

 three or four tunes as long as broad ; distal edges of the third and following segments 

 are produced and spinous. The pinnule resembles the lower pinnules in certain of 

 the more slender species of Colobometra. P, is similar to P a , 11 mm. long, with 17 

 segments. P b is similar to P 3 , 8 mm. long, with 18 segments. P 3 is 8 mm. long, 

 with 18 segments, proportionately slenderer than P 2 and with much shorter segments, 

 which become as long as broad on the third and twice as long as broad basally on the 

 tenth or eleventh. P c and P 4 are 7.5 mm. long, with 18 segments, and resemble the 

 preceding pinnules; the distal pinnules are 12 mm. long, with 20-24 segments, which, 

 beyond the fifth, are twice, and distally three times, as long as broad, with very 

 finely spinous distal ends. 



The deposits along the ambulacra in this species are essentially the same as in 

 E. junceus. 



Notes.- The preceding description was drawn up from the type specimen from 

 Siboga station 310. 



The arms in the six specimens from the Danish Expedition to the Kei Islands 

 station 54 are up to 55 mm. in length. 



The specimen from off Jolo hi about 46 meters may be thus described: The 

 centrodorsal is thin discoidal with a broad flat dorsal pole; the cirrus sockets are 

 arranged in a single regular marginal row. The cirri are XV, 17, moderately stout 

 and strongly curved. The first two segments are more than twice as broad as long, 

 and those following are all about as long as broad, the fourth being sometimes, but 

 not always, slightly longer than broad. The third and fourth segments are rather 

 strongly constricted centrally, and the two following have somewhat flaring distal 

 ends. The opposing spine is prominent, conical, with the apex median, and rises to 

 a height equal to half the width of the penultimate segment. The terminal claw is 

 slightly longer than the penultimate segment, rather stout, and strongly and usually 

 evenly curved. The radials have a slightly and very finely roughened distal border. 

 The brachial structure resembles that of E. indivisus. The distal edges of the bra- 

 chials are very finely spinous but are not produced. 



PC is about 6 mm. long and is composed of 15 segments; it tapers evenly from a 

 fairly broad base to the tip. The first two segments are much broader than long, 

 the fourth is about as long as broad, and the remainder are about half again as long 

 as broad. The pinnule is not obviously prismatic, the dorsal ridge being so broadly 

 rounded as scarcely to be evident. Each of the first five segments bears a conspicuous 

 sharp carinate process with the crest straight and parallel to the longitudinal axis of 

 the pinnule. On the first segment this crest occurs only in the distal half, but it 

 occupies the entire side of the other segments. It is highest on the second-fourth 

 segments, lower on the fifth, and very low on the sixth. Pj is very slightly longer 

 than PC and also stouter. It is composed of 14 segments, which become about as 

 long as broad on the fourth and half again as long as broad distally. The first four 



