PART 5 A MONOGRAPH OF THE EXISTING CRIN'OIDS 725 



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

 broad; the pinnules and cirri are unknown. 



Description. The centrodorsal is sharply conical with straight sides, 3.5 uim. in 

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

 hi vertical height A.M.C.]. It is thickly covered with very numerous cirrus sockets 

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



The cirri are unknown. 



The distal borders of the radials are even with the rim of the centrodorsal in the 

 median line, and slightly produced, very much less than in most related species, in 

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



The IB^ are very short, from eight to ten times as broad as the median length, 

 the proximal border parallel with the curved border of the radials, the distal border on 

 either side of the 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. 

 The bases of the IBr, are widely free laterally. The IBr 2 (axillaries) are about as 

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

 somewhat beyond the distal angles of the IB^ 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 syzygy, though some pieces remain attached 

 in one syntype. The first brachial is extremely short in the median line, very slightly 

 longer in inner length, but four or five tunes 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 relatively 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 IB^ to the second syzygy at 9 + 10 is about 10.5 mm. in the syntype in 

 the Amsterdam Museum. 



Locality. Siboga station 119; Celebes Sea (lat. 133'30" N., long. 12441' E.); 

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



FARIOMETRA SOKOTRAE John 



Thaumatometra, 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 Crinolden der Antarktis, 1915, p. 147 (same); John Murray Exped. 



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

 Thaumatometra sokotrae 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 tunes 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 IB^ not being narrowed distally. 



Description. The centrodorsal is a high cone, nearly as high as it is broad at the 

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

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



