398 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxvi. 



the apical tubercle, however, remaining in the same position, and 

 therefore occupying a place below the center of the now almost 

 straight tubercular ridge; as the joints decrease in length distally, 

 the apical tubercle gTadually disaj^pears, and the transverse ridge 

 moves gradually to a median position; on becoming median, it at 

 first has usually four tubercles, this being later reduced to three, 

 while beginning on about the fifteenth from the end there are onlj' 

 two, the last three or four joints before the penultimate bearing only 

 a single median tubercle; opposing spine comparativel}' large, aris- 

 ing from the entire dorsal surface of the joint, 'the apex subterminal, 

 equal to about half the diameter of the penultimate joint in height; 

 terminal claw somewhat longer than the penultimate joint, rather 

 stout, and strongly curved. 



Ends of the basal rays not visible ; radials short in the median line, 

 but extending far up into the angles of the calyx, reaching the disk, 

 and separating the bases of the I Br^; I Br^ slightly trapezoidal, 

 about twice as broad basally as long," very widely separated laterally, 

 well rounded dorsally; I Br^, (axillary) pentagonal, about as long as 

 broad ; II Br 2, one series only being present. 



Arms eleven in number (in the type), very Avidely separated. All 

 the arms are broken otf at the sj^zygy betAveen the third and fourth 

 brachials. First brachial slightly wedge-shaped, half again as broad 

 as long, interiorly united for the anterior half or two-thirds, diverg- 

 ing distally as approximately a right angle; second brachial nearly 

 square; third (hypozygal) oblong, three times as broad as long. 



Pj slender, 15 mm. long, evenly tapering, with twenty to twenty- 

 five joints, the first twice as broad as long, the second and third 

 squarish, the following about twice as long as broad, shorter termi- 

 nally. 



Color. — Purplish brown. 



Type— Cat. No. 25468, U.S.N.M., from AIbatros,s station 5145; oif 

 Jolo town ; 28 fathoms. 



Genus CENOMETRA A. H. Clark. 

 CENOMETRA DELICATA, new species. 



Centro-dorsal discoidal, the polar area slightly concave; cirrus 

 sockets marginal, arranged in two closely crowded alternating rows. 



Cirri XIX, 31-33, 20 nun. long, comparatively slender; first joint 

 short, the remainder subequal, about twice as broad as long; joints 

 somewhat flattened dorsally, after the tenth bearing very small blunt 

 paired median dorsal tubercles; opposing spine triangular, arising 

 from the entire surface of the penultimate joint, blunt, the apex 

 median in position; terminal claw about as long as the penultimate 

 joint, rather stout and strongly curved. 



Ends of the basal rays visible as flattened tubercles in the angles 

 of the calyx, but difficult to differentiate from the centro-dorsal; 



