A MONOGRAPH OF THE EXISTING CRINOIDS 133 



CATOPTOMETRA BUBBOFLAVA (A. H. Clrk) 



PLATE 8, FIGURE 27; PLATE 9, FIGURES 30, 33 



Antedon rubroflava A. H. CLARK, Proc. U. S. Nat. Mus., vol. 33, 1907, p. 127 (color in life), p. 150 

 (description; Albatross station 4880), p. 151 (comparison with A. [Catoptomelra] hartlaubi); vol. 

 34, 1908, p. 493 (listed). 



Zygometra rubroflava A. H. CLARK, Smithsonian Misc. Coll., vol. 50, 1907, p. 348 (listed); Proc. 

 U. S. Nat. Mus., vol. 34, 1908, p. 271 (relation to the species of Eudiocrinus). 



Catoplometra rubroflava A. H. CLARK, Proc. U. S. Nat. Mus., vol. 34, 1908, p. 317 (listed); Smith- 

 sonian Misc. Coll., vol. 52, 1908, p. 210 (compared with C. magnified); Vid. Medd. Naturh. 

 Foren. K0benhavn, 1909, p. 153 (off the Goto Island, 36 and 100 fathoms; description of 

 specimens); Crinoids of the Indian Ocean, 1912, p. 106 (synonymy; habitat); Proc. Biol. Soc. 

 Washington, vol. 26, 1913, p. 178 (range in eastern Asia), p. 181 (2212' N., 11415'E., 14 

 fathoms; description of specimens) ; Journ. Washington Acad. Sci., vol. 5, 1915, p. 214 (southern 

 Japanese species; range and its significance); Amer. Journ. Sci., vol. 40, 1915, p. 62 (listed); 

 Unstalked crinoids of the Siboga-Exped., 1918, p. 63 (in key; range). GISLN, Zool. Bidrag 

 Uppsala, vol. 9, 1924, pp. 74, 77 (syzygies), fig. 67, p. 75 (syzygial face), fig. 97, p. 87 (synarthrial 

 face); Vid. Medd. Dansk Naturh. Foren., vol. 83, 1927, p. 2 (stations 2, 10; [7J-135 m.), p. 

 21 (Mortensen's stations 2, 10; notes), p. 68 (listed), figs. 9, 10, p. 15; Kungl. Fysiogr. Sallsk. 

 Handl., new ser., vol. 45, No. 11, 1934, p. 21. 



Diagnostic features. The arms are 1 1-14 in number, the IIBr series being 4 (3+4), 

 and are 100-180 mm. long; the cirri are short and stout, strongly and evenly recurved, 

 with 15-20 segments, few or none of which are longer than broad. 



So far as is known the color hi life is always bright yellow broadly and regularly 

 banded with bright red. Except for the very different C. magnified there is no other 

 comatulid in the area where this occurs that is at all similar in color. 



Description. The centrodorsal is broad, discoidal, with the bare polar area 

 concave. The cirrus sockets are arranged in two closely crowded marginal rows. 



The cirri are XXXV-XL, 15-20, stout, about 17 mm. hi length. The first 

 segment is about twice as broad as long, the second is about as long as broad, the third- 

 eighth or third-tenth are slightly longer than broad with a strong central constriction 

 and prominent ends, and those following become about as long as broad, the expan- 

 sion of the ends gradually dying away. The penultimate segment bears a short and 

 small, but prominent, opposing spine, which is subterminal in position but sometimes, 

 owing to the occasionally rather strongly trapezoidal shape of the penultimate seg- 

 ment, appears to be terminal. The opposing spine is directed diagonally outward. 

 The terminal claw is considerably longer than the penultimate segment, moderately 

 stout and moderately curved. Like the opposing spine it is semitransparent and 

 glassy in strong contrast to the dull and brownish cirrus segments. The cirri are 

 laterally compressed in the outer two-thirds. 



This disk is lacking. Large and closely crowded sacculi are found on the 

 pinnules. 



The radials are very short in the midradial line but are visible as low triangles 

 in the interradial angles of the calyx. The IBr! are very short, oblong, strongly 

 rounded dorsally, and well separated laterally. The IBr 2 are broadly triangular, two 

 and one-half or three times as broad as long, and about three times as long as the 

 IBr^ The IIBr series are 4(3+4), hi the typo specimen only present on one ray. 



The 11 arms (in the type specimen) are 180 mm. in length, very long and slender. 

 The first 9 or 10 brachials are oblong or slightly wedge-shaped, over twice as broad as 



