PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 725 



Diagnostic features. — The second brachials are shield-shaped and much longer than 

 broad; the pinnules and cini are unknoM-n. 



Description. — The centrodoi-sal is sharply conical with straight sides, 3.5 mm. in 

 diameter at the base and 3.0 mm. from the apex to the interradial border [or 2.5 mm. 

 in vertical height — A.M.C.]. It is thicldy covered ^vith very numerous cirrus sockets 

 [wliich appear to be arranged in vertical rows at least interradially — A.M.C.]. 



The cirri are unkno\ra. 



The distal borders of the radials are even ^vith the rim of the centrodorsal in the 

 median line, and slightly produced, ver\' much less than in most related species, in 

 the interradial angles. The distal angles of the radials are slightly separated. 



The IBri arc very short, from eight to ten times as broad as the median length, 

 the proximal border parallel ^sith the curved border of the radials, the distal border on 

 either side of tlic median line convex, nearly parallel with the concave proximal sides 

 of the axillaries; in direct lateral view (viewed at right angles to the dorsoventral axis) 

 the IBri appear almost or quite bisected by the proximal process of the axillaries. 

 Tlie bases of the IBr, are widely free laterally. The IBrj (a.xillaries) are about as 

 broad as long with the distal angle considerably produced; the lateral angles project 

 somewhat beyond the distal angles of the IBrj so that narrow elongate water pores are 

 formed. Neither of these two ossicles have ventrolateral processes. 



The 10 arms are all broken at the first syzygj^, though some pieces remain attached 

 in one s\mtypc. The first brachial is extremeh* short in the median line, very slighth* 

 longer in inner length, but four or five times as long externally; the inner sides of two 

 adjacent first brachials diverge at approximately a right angle. The second brachial 

 is longer than broad, rather sharply convex dorsally, with the proximal sides rather 

 strongly concave so that a relativelj' long and narrow process incises the first brachial. 

 There is little or no eversion of the distal edges of the brachials, which are almost or 

 quite smooth. 



The width of the arm at the first syzygy is 1 .6 mm. and the length from the proximal 

 edge of the IBri to the second syzygy at 9+10 is about 10.5 mm. in the syntype in 

 the Amsterdam Museimi. 



Locality.— Siboga station 119; Celebes Sea (lat. 1°33'30" N., long. 124°41' E.); 

 1901 meters [A. H. Clark, 1918] (2, U.S.N.M., E. 438; Amsterdam M.). 



FARIOMETRA SOKOTRAE John 



TTiaumatometra, sp. A. H. Clark, Proc. U.S. Nat. Mus., vol. 40, 1911, p. 51 (lat. 14° 20' N., long. 52° 



30' E.); Crinoids of the Indian Ocean, 1912, p. 247 (same); Smithsonian Misc. Coll., vol. 61, No. 



15, 1913, p. 71 (same); Die Crinoiden der Antarktis, 1915, p. 147 (same); John Murray Exped. 



1933-34, Sci. Reports, vol. 4, No. 4, 1937, p. 102 (same), pp. 104, 105. 

 Thaumatometra sokolrae John, Ann. Mag. Nat. Hist., ser. 10, vol. 20, 1937, p. 169 (description); fig. 3 



p. 170; pi. 3, fig. 3. 



Diagnostic features. — The centrodorsal is conical, almost as high as it is wide at the 

 base; the cirri are about LX, 21-36, the longest segments about four times as long as 

 their median widths and even the distalmost segments are still slightly longer than wide; 

 the IBr series have more or less straight sides, the IBr, not being narrowed disfally. 



Description.— 'YhQ centrodorsal is a high cone, nearly as higli as it is broad at the 

 base, with almost straiglit sides. The apex is rounded in the four larger specimens, 

 truncated in the smaller. The ventral edge is produced into strong interradial angles 



