A MONOGRAPH OF THE EXISTING CRINOIDS 27 



bear dorsally paired spines or tubercles; the elements of the division series and first 

 two brachials bear flangelike ventrolateral extensions. 



The stout curved cirri composed of very short segments bearing paired spines or 

 tubercles dorsally, the much enlarged, stout, and stiff P 2 , and the ventrolateral exten- 

 sions of the elements of the division series and first two brachials make this genus 

 easily recognizable. 



Geographical range. From Annam, the Bonin, Marshall, Fiji, and Philippine 

 Islands to northwestern Australia, thence westward to Ceylon, the Seychelles, and 

 Mauritius. 



Baihymelrical range. From the shore line down to 55 (66?) meters. 



KEY TO THE SPECIES IN THE GENUS CENOMETRA 



a 1 . No carination on the basal segments of the lower pinnules, except occasionally in very large 

 individuals (from Annam, the Philippine, Bonin, Marshall, and Fiji Islands to Java and 



Sumatra, and northward to the Arrakan coast of Burma; 0-55 meters) bella (p. 27) 



a 3 . Basal segments of the lower pinnules carinate. 



ft 1 . No carination on the basal segments of P 2 though those of P s and the following pinnules are con- 

 spicuously carinate (Ceylon and the Gangam coast, Madras Presidency; 14-21 [?66] 



meters) herdmani (p. 43) 



6 a . Basal segments of P 2 carinate. 



c 1 . Carination of the basal segments of P 2 slight, with the crest straight and parallel with the 



axis of the segments (northwestern Australia) cornuta (p. 44) 



c'. Carination of the basal segments of P 2 high and conspicuous, with the crest convex 

 (Mauritius and the Seychelles) emendatrix (p. 46) 



CENOMETRA BELLA iHartlaub) 



PLATE 3, FIGURES 9, 10; PLATE 5, FIGURES 20-24; PLATE 6, FIGURE 25; PLATE 7, FIGURES 28-30; 



PLATE 8, FIGURE 37 



[See also vol. 1, pt. 1, fig. 16 (disk), p. 67; fig. 87 (lateral view), p. 143; fig. 345 (cirrus), p. 289; 

 pt. 2, fig. 53 (radial pentagon), p. 33; fig. 122 (arm bases;, p. 79; fig. 254 (arm), p. 205; fig. 274 

 (arm and pinnules), p. 213.] 



Antedon bella HARTLAUB, Nachr. Ges. Gottingen, May 1890, p. 174 (description; Noordwachter 

 Eiland, 15-20 fms.); Nova Acta Acad. German., vol. 58, No. 1, 1891, p. 11 (collected by Brock), 

 p. 37 (in key), p. 43 (detailed description and comparisons), p. 113 (in Gottingen Mus.), pi. 

 2, figs. 23, 26. HAMANN, Bronns Klassen und Ordnungen des Tier-Reichs, vol. 2, Abt. 3, 1907, 

 p. 1581 (listed). A. H. CLARK, Proc. U. S. Nat. Mus., vol. 34, 1908, p. 461 (listed); Crinoids 

 of the Indian Ocean, 1912, p. 37 (of Hartlaub, l891 = Cenometra bella), p. 40 (of Chadwick, 

 1904 = C. herdmani). GISLEN, Kungl. Fysiogr. Sallsk. Lund Forh., vol. 7, No. 1, 1936, p. 4 

 (French Indo-China). 



Antedon bella var. brunnea HARTLAUB, Nova Acta Acad. German., vol. 58, No. 1, 1891, p. 44 (de- 

 tailed description and comparisons; Noordwachter Eiland, 15-20 fms.). A. H. CLARK, Proc. 

 U. S. Nat. Mus., vol. 34, 1908, p. 461 (listed); Crinoids of the Indian Ocean, 1912, p. 37 

 (identity). GISLEN, Kungl. Fysiogr. Sallsk. Lund Forh., vol. 7, No. 1, 1936, p. 15 (relation 

 to C. unicornis). 



Antedon abbotti A. H. CLARK, Proc. U. S. Nat. Mus., vol. 33, 1907, p. 148 (description; Pulo Taya, 

 China Sea). 



Himerometra abbolli A. H. CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 356 (listed); 

 vol. 52, pt. 2, 1908, p. 217 (nearly related to H. unicornis). 



Himerometra bella A. H. CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 356 (listed); vol. 

 52, pt. 2, 1908, p. 217 (nearly related to H. unicornis). 



Himerometra unicornis A. H. CLARK, Smithsonian Misc. Coll., vol. 52, pt. 2, 1908, p. 216 (descrip- 

 tion; Albatross station 5160; also stations 5141, 5147, 5163). 



