480 



BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



mm 



FiGURK 23. — Nanometra clymene A. H. 

 Clark: a, Paratype, Siboga station 251; 

 b, holotype, part of arm with Pj to Pj. 



ponultiinatc are twice as broad as long. On the fourth and following segments the distal 

 dorsal edge projects slightly, this on the short outer segments becoming a prominent 

 median carination with a convex profile occupying the entire dorsal surface of the 

 segments. 



The ends of the basal raj's are visible as rather prominent rounded triangular areas 

 in the angles of the calyx. 



The radials are rather prominent, and are nearly as long in the median Hne as 

 laterally. The plane of their middorsal line makes an angle of almost 90° with the 

 dorsoventral axis. The IBr, are 4 times as broad as long in the median line; the lateral 

 edges are from a third to a half again as long as the median length, strongly convergent, 

 continuing in the same direction as the lateral portion of the distal border of the radials 

 on either side; the median third of the proximal border is slightty convex; the distal 

 border is deeply incised by a posterior rounded projection from the axillary; the distal 

 half of the lateral borders is produced in the form of a prominent tubercular process. 

 The IBr2 (axillaries) are about as broad as long, with the anterior angle slightly 

 produced and the anterior sides making approximately a right angle with each other; 

 a strong rounded posterior process extends to about the same distance below the line 

 passing through the two lateral angles that the anterior angle reaches above it; just 

 below the lateral angles there is a prominent tubercular process; the distal edges, like 

 the lateral portions of the distal edge of the IBrj, are bordered with exceedingly fine 

 spines. The synarthrial tubercles, though broadly rounded, are rather prominent. 



The 10 arms are 120 mm. long. The fii'st brachials are short, three times as long 

 exteriorly as interiorly, slightly longer in the median line than interiorly; the interior 

 borders are in apposition; the outer borders are slightly concave; the distal inner 

 corners bear a rudunentary tubercle similar to that on the outer part of the lateral 

 borders of the IBr,. These tubercles on the IBr,, with the adjacent tubercles under the 

 lateral angles of the axillaries, almost close what otherwise would be a large rhombic 



