. Bulletin - United States National Museum. Science. 528 BULLETIN 82, UNITED STATES NATIONAL MUSEXIM VOLUME l. 2mnn Figure 27.—Psathyromelra anomala A. H. Clark, holotype: a. Radial view; b, centro- dorsal from the other side; c, proximal part of P2; d, part of genital pinnule beyond gonad. PSATHYROMETKA GRACILLIMA A. H. Clark FionRE 28 [See also vol. 1, pt. 2, figs. 578, 579, p. 298] Psaihyrometra graciUima A. H. Clark, Proc. Biol. See. Washington, vol. 22, 1909, p. 149 (description; 19''35' N., 92°24' E.; 272 fms.); Crinoids of the Indian Ocean, 1912, p. 21 (intermediate between Psathyromelr
. Bulletin - United States National Museum. Science. 528 BULLETIN 82, UNITED STATES NATIONAL MUSEXIM VOLUME l. 2mnn Figure 27.—Psathyromelra anomala A. H. Clark, holotype: a. Radial view; b, centro- dorsal from the other side; c, proximal part of P2; d, part of genital pinnule beyond gonad. PSATHYROMETKA GRACILLIMA A. H. Clark FionRE 28 [See also vol. 1, pt. 2, figs. 578, 579, p. 298] Psaihyrometra graciUima A. H. Clark, Proc. Biol. See. Washington, vol. 22, 1909, p. 149 (description; 19''35' N., 92°24' E.; 272 fms.); Crinoids of the Indian Ocean, 1912, p. 21 (intermediate between Psathyromelra and Leplometra), p. 236 (synonymy; detailed description; locality), fig. 44, p. 237; Die CrinoJden der Antarktis, 1915, p. 116 (range); Unstalked crinoids of the .St'boi/a-Exped., 1918, pp. 225, 226 (in key; range), p. 228 (references). Diagnostic features.—The centrodorsal is sharply conical but much wider at the base than it is high, the ratio being about :1; the bare interradial areas are usuallj' much wider than the individual peripheral sockets and are grooved; the sockets lie fairly dose together in each radial area and are arranged in two (apically) to four (peripherally) more or less regular columns; the arms are rather slender in the holotype, the ratio of the length of the division series plus the first nine brachials to the width of the first syzygy being :1 as opposed to about :1 in the two specimens of Ps. mira measured; the cirri probably taper evenly like those of mira with the terminal segments elongate. Description.—The centrodorsal is sharply conical, 4 mm. broad at the base and mm. high, its sides divided into 5 radial areas by 5 interradial furrows which are somewhat broader than the adjacent cirrus sockets. There are from 8 to 10 well- separated cirrus sockets in each radial area which are arranged in 4 more or less irregular colimins. The cirri are XIj-L, about 25, long, slender, smooth and Please note that
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