730 



BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



VOLUME 1 



defined cirrus sockets arranged in shallow diagonal rows, though some tendency to align- 

 ment in vertical columns is evident on the peripheral half of the centrodorsal. The apex- 

 is covered with a number of thorny-tipped papillae. 



The cirri are about XL. No complete peripheral ones remain but the longest of 

 those in the next row has 22 segments. Most of the segments have very flared distal 

 and to a lesser extent proximal ends. The second one is already longer than its median 

 width and the fourth and fifth, which are the longest, are three times as long as their 

 median widths or twice the width of their distal ends. The last 5 or 6 segments before 

 the terminal claw are little, if at all, longer than wide. These last segments are much 

 less flared and develop a slightly carinate dorsal spine. 



The radials are very short in the median line, but extend well up in the angles of 

 the calyx so that the bases of the IB^ are not in apposition. 



The IBri are very short, about five times as broad as long in the median line, slightly 

 longer laterally than centrally; the lateral borders are parallel; the distal edges, except 

 in the median line, are everted and finely spinous; the proximal border is slightly everted; 

 there is a tuft of spines on each of the distal angles. The IBr 2 (axillaries) are almost 

 triangular with only a moderate proximal angle and slightly broader than long; the distal 

 edges are slightly everted and very finely spinous; the lateral angles are covered with 

 spines; the IBr series and lower brachials are in lateral contact except for small " + " 

 shaped water pores between adjacent articulations. 



FIGURE 45. Fariometra io (A. H. Clark), holotype. 



The 10 arms are about 30 mm. long; the brachials have only very slightly produced 

 and very finely spinous distal ends. Syzygies occur at brachials 3 + 4 and 9 + 10 and the 

 distal intersyzygial interval is two muscular articulations. The width at the first 

 syzygy is 0.9 mm. and the length from the proximal edge of the IBri to the second 

 syzygy is 5.5 to 6.0 mm. 



No complete PI is present. P 2 has 9+ segments, probably about 12. The longest 

 segments are up to four times as long as broad. P b or P 3 is the first genital pinnule. 



