370 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Calometra multicolor A. H. CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 363 (listed); 

 Proc. U. S. Nat. Mus., vol. 34, 1908, p. 313 (various localities in Sagami Bay and Tokyo Gulf); 

 Smithsonian Misc. Coll., vol. 52, pt. 2, 1908, p. 224 (compared with C. acanthaster) ; Proc. Biol. 

 Soc. Washington, vol. 22, 1909, p. 79 (compared with C. spinosissima) ; Proc. U. S. Nat. Mus., 

 vol. 36, 1909, p. 366 (radials compared with those of Comatilia); vol. 39, 1911, p. 544 (belongs 

 to the same group as acanthaster, spinosissima, and alecto), p. 545 (disk, calyx, and arm bases 

 compared with those of C. alecto). 



Calometra thetis A. H. CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 363 (listed). 



Neometra multicolor A. H. CLARK, Zool. Anz., vol. 39, 1912, No. 11/12, p. 422 (arms compared with 

 those of N. sibogae), p. 423 (brachials compared with those of Calometra diana); Smithsonian 

 Misc. Coll., vol. 60, No. 10, 1912, p. 29 (Okinose; 55 fms.); Crinoids of the Indian Ocean, 1912, 

 p. 183 (synonymy; range); Rec. Western Australian Mus., vol. 1, pt. 3, 1914, p. 128 (position 

 within the genus), p. 130 (characters; range); Journ. Washington Acad. Sci., vol. 5, No. 6, 1915, 

 p. 214 (range and its significance); Unstalked crinoids of the Siboga-Exped., 1918, p. 133 (in 

 key; range); Smithsonian Mis. Coll., vol. 72, No. 7, 1921, pi. 1, fig. 5 (disk). GISL^N, Nova 

 Acta Reg. Soc. Sci. Upsaliensis, ser. 4, vol. 5, No. 6, 1922, p. 94 (Bock's station 12; characters 

 of the specimens), figs. 75, a, 6, 76, p. 88 (pinnules); Zool. Bidrag Uppsala, vol. 9, 1924, p. 22 

 (Mortensen's station 24, southern Japan ; development of distal pinnules into arms) , p. 79 (non- 

 muscular articulations), fig. 77, p. 81 (syzygial face), fig. 104, p. 87 (synarthrial face), figs. 

 168-172, p. 98 (pinnule articulations) ; Vid. Medd. Dansk Naturh. Foren., vol. 83, 1927, p, 2 

 (occurrence of IIBr series; stations 9, 13, 20, 24, 25; 108-900 meters), p. 30 (same stations; 

 notes), pp. 68, 69 (listed); Kungl. Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 1934, p. 20. 



Neometra multicor GISLJSN, Zool. Bidrag Uppsala, vol. 9, 1924, p. 22 (editorial error). 



Diagnostic features. The 20 arms are never over 85 mm. and rarely over 65 

 mm. in length; there are 35 cirrus segments of which the distal bear a single median 

 keel. 



Description. The centrodorsal is thick discoidal with the large bare polar area 

 flat or slightly convex. The cirrus sockets are arranged in a single marginal row. 



The cirri are XV, 35, about 20 mm. long. The segments increase in length to 

 the sixth, which is about as long as broad, then remain uniform to about the fifteenth, 

 after which they gradually decrease in length so that the distal segments are about 

 twice as broad as long, becoming again about as long as broad on the terminal 4 or 5. 

 The distal ends of the segments project somewhat dorsally, this projection increasing 

 in the distal half of the cirri where it forms broad, rather blunt and rounded, though 

 prominent, dorsal spines. The opposing spine is triangular, blunt, with the apex 

 terminally situated, arising from the entire dorsal surface of the penultimate seg- 

 ment, and in height equal to about half the width of that segment. The terminal 

 claw is stout, blunt, but little curved, and less than the penultimate segment in length. 



The ends of the basal rays are usually not visible in the angles of the calyx, 

 but they sometimes appear as small rounded tubercles. 



The radials are short hi the median line, sometimes scarcely projecting beyond 

 the rim of the centrodorsal; but in the interradial angles they form large triangles 

 the apices of which are strongly produced anteriorly, entirely and usually widely 

 separating the bases of the IBr t . Occasionally, though somewhat rarely, the 

 anterior prolongation of the triangle formed by the radials in the interradial angles 

 does not quite reach to the bases of the IBr! in one or two of the interradial areas. 

 The IBr, are trapezoidal, narrower distally than proximally, about twice as broad 

 as the distal width; the proximal corners are somewhat truncated by the interradial 

 prolongations of the radials. The IBr 2 (axillaries) are pentagonal, about half again 



