A MONOGRAPH OF THE EXISTING CRINOIDS 127 



Catoptometra magnified var. minor Gisl£n, Nova Acta Reg. Soc. Sci. Upsaliensis, ser. 4, vol. 5, 

 No. 6, 1922, p. 4 (127-182 m.), p. 65 (description; Bock's stations 46, 47, 59, 61), p. 67 

 (also in Mortensen's collection), figs. 46, 47, p. 70; Vid. Medd. Dansk Naturh. Foren., vol. 83, 

 1927, p. 2 (stations 10, 13, 24, 26; 109-900 m.), p. 20 (stations 10, 13, 24, 26; notes), pp. 68, 

 69 (listed). 



Catoptometra magnified minor Gisl^n, Nova Acta Reg. Soc. Sci. Upsaliensis, ser. 4, vol. 5, No. 6, 

 1922, p. 6 (Bonin Islands), p. 8, p. 27 (tabulation of characters), pp. 182, 183 (listed), figs. 

 46, 47, p. 70; Zool. Bidrag Uppsala, vol. 9, 1924, p. 71 (nonmuscular articulations), p. 74 (syzygies), 

 p. 285 (Kiu Shiu, Japan, 900 m.; details), p. 286, fig. 59, p. 75 (syzygial face); Kungl. Fysiogr. 

 Siillsk. Handl., new ser., vol. 45, No. 11, 1934, p. 24. 



Diagnostic features. — All the division series are of two ossicles only, and tbe arms 

 are more than 30 in number. The cirri are long, stout, recurved, and knobby, com- 

 posed of 18-25 segments and reaching 30-35 mm. in lengtb. The arms are 130-140 

 mm. long. 



Specimens from the Philippines were apparently in life bright yellow with regular 

 bands of brigbt red on the arms. They were readily distinguisbed by this coloration 

 from the species with which they were associated. But Catoptometra rubroflava 

 always and C. ophiura sometimes is of the same color, while it is not certain that this 

 species is constant in its coloration. 



Description. — The centrodorsal is discoidal, large, with a broad polar area 5 

 to 10 mm. in diameter, which is moderately concave with a deep rounded pit in the 

 center. The cirrus sockets are arranged in two closely crowded and irregular more 

 or less alternating rows. 



The cirri are XXX-XL, 18-25 (usually 20-24), 30-35 mm. in length, stout and 

 knobby in appearance. The first segment is about twice as broad as long, the second 

 is not quite so long as broad, the third is about as long as broad or very slightly longer 

 than broad, the fourth is slightly longer, and the fifth is slightly longer still, about 

 half again as long as its median width. The next three segments are similar to the 

 fifth and those following gradually decrease in length so that the terminal six or seven 

 are about as long as broad. Tbe opposing spine, though prominent, is small, terminal- 

 ly situated, rarely reaching to more than one-third the width of the penultimate 

 segment in length. The terminal claw is large, longer than the penultimate segment, 

 usually half again as long and sometimes even longer, stout and moderately curved. 

 The lateral and dorsal profiles of the cirrus segments are deeply concave, though the 

 ventral profile is nearly straight. This causes the articulations to stand out promi- 

 nently and gives the cirri a characteristic appearance, like those of C. rubroflava. 

 This feature becomes less and less marked as the segments decrease in length distally. 



The disk is more or less plated along the ambulacral grooves. 



The radials, and usually also the IBr b are concealed by the centrodorsal. When 

 visible the IBr, are very short and are united in their proximal half but widely sep- 

 arated distally. The IBr 2 (axillaries) are short, triangular, in the smaller specimens 

 about three times as broad as long, in the larger four or five times as broad as long. 

 The IIBr, IIIBr, and IVBr series are 2. The first ossicles following each axillary 

 are interiorly united for their proximal half, but their distal halves diverge from the 

 point of union almost in a straight fine so that the division series and the arms are 

 well separated. 



