A MONOGRAPH OF THE EXISTING CRINOIDS 43 



the synonymy and the habitat of each. The errors made in 1908 in regard to the 

 habitats of the last two were repeated. The diagnosis of Cenometra insueta was 

 repeated, and figures of a cirrus in lateral and dorsal view were given. 



Dr. Hubert Lyman Clark in 1915 pointed out that the legends of the figures 

 of the cirri of Cenometra insueta and of C. herdmani published by the author in 1912 

 had been interchanged and that the lateral and dorsal views of a cirrus labeled Ceno- 

 metra herdmani in reaUty represented a cirrus of C. insueta. 



Dr. Torsten Gisl6n in 1922 recorded and described in detail a specimen of Ceno- 

 metra hella from Dr. SLxten Bock's Expedition to Japan, 1914, station 49, and in 1924 

 discussed various structural features of the species. In 1936 Dr. Gisl^n recorded and 

 described a specimen from Annam and remarked that it was doubtful whether ■uni- 

 cornis could be kept separate from hella. In 1940 he recorded and gave notes on one 

 specimen from Fiji collected by Dr. Sixten Bock in 1917, and three from the Marshall 

 Islands collected by Dr. Chr. Hessle in the same year. He considered these as 

 representing a new form, which he called Cenometra hella var. magnifica. 



CENOMETRA HERDMANI A. H. Clark 



Plate 4, Figures 13-15; Plate 6, Figures 26, 27; Pl.\te 7, Figures 31, 32; Plate 8, Figures 33, 



35, 36 



Antedon bella Chad wick, in Herdman, Report Ceylon Pearl Oyster Fisheries, pt. 2, suppl. rep. U, 

 1904, p. 153 (occurs at Ceylon), p. 1^5 (stations LIII, LVII; characters). 



Cenometra herdmani A. H. Clark, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 145 (description; 

 Ganjam coast; 12 fathoms); Crinoids of the Indian Ocean, 1912, p. 40 {=^Antedon bella Chad- 

 wick, 1904), p. 154 (synonymy; description; localities), fig. 19, a, b, p. 154; fig. 20, p. 155; fig. 

 21, a, b, p. 156, p. 321 (off Gopalpore; notes). — H. L. Clark, Spolia Zeylanica, vol. 10, pt. 37, 

 1915, p. 85 (Ceylon; record of a fragmentary specimen; exchange of legends on the figures in 

 A. H. Clark, 1912, noted).— Gisl£n, Kungl. Svenska Vet.-Akad. Handl., ser. 3, vol. 18, Xo. 10, 

 1940, pp. 12, 13. 



Cenometra insueta A. H. Clark, Crinoids of the Indian Ocean, 1912, fig. 19, a, b, p. 154 (cirrus), but 

 not description, p. 154, which is C. bella. 



Cenometra herdmanni Gisl£n, Kungl. Fysiogr. Sallsk. Handl., new ser., vol. 45, No. 11, 1934, p. 25. 



Diagnostic features. —l:he basal segments of the proximal pinnules, with the excep- 

 tion of Pj, are carinate. There are 20-30 arms. Pj is more slender than it is in 0. 

 hella. 



Description. — This species resembles C. hella in general appearance, but it is 

 more slender, especially in regard to the cirri. 



P2 is comparatively slender and short, being only very slightly, when at all, 

 longer than Pi; it is composed of relatively few segments, these numbering less than 

 20. There is no carination on the basal segments of Pj, though those of P3 and the 

 following pinnules are conspicuously carinate. 



The paired dorsal tubercles on the cirrus segments, which are small, are very close 

 together, their apices being separated by less than half the transverse width of the 

 segments. 



The arms are about 30 in number. 



The color in alcohol is flesh color, the cirri and P2 dull straw yellow, with a grayish 

 wash on the disk wliich extends more or less over the division series; or, deep purple, 

 evenly studded with small circular black spots, the cirri yellow-brown; or, flesh color 

 with purple bands on the arms. 



