A MONOGRAPH OF THE EXISTING CRINOIDS 355 



Oephyrometra listing under it as nominal species O. versicolor and 0. propinqua, giving 

 the synonymy and range of each. 



In 1936 Prof. Torstcn Gisl(5n recorded and gave notes on two specimens of Oephy- 

 rometra versicolor that had been collected at Nha'trang, southern Annam, by 

 Dr. C. Dawydoff. 



Genus NEOMETRA A. H. Clark 



Antedon (part) H. L. Clark, in McClendon, Bull. Amer. Mus. Nat. Hist., vol. 23, 1906, pp. 120, 

 125, 126, and following authors. 



Calometra (part) A. H. Clark, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 302. 



Neometra A. H. Clark, ZooI. Anz., vol. 39, 1912, No. 11/12, p. 421 (used as a generic name in the 

 description of Neometra sibogae); Crinoids of the Indian Ocean, 1912, p. 11 (occurs in the 

 Andamans), p. 23 (range), p. 58 (in key), p. 181 (diagnosis; genotype Antedon multicolor A. H. 

 Clark, 1907; systematic position); Rec. Western Australian Mus., vol. 1, pt. 3, 1914, p. 130 

 (characters of the species); Unstalked crinoids of the Siboga-Kxped., 1918, p. viii (discovery of 

 2 new types by the Siboga), p. 132 (key to the included species). — Gisl^n, Nova Acta Reg. 

 Soc. Sci. Upsahensis, ser. 4, vol. 5, No. 6, 1922, p. 9 (relationship to Calometra), pp. 94, 95, 96; 

 Zool. Bidrag Uppsala, vol.9, 1924, p. 100. — H. L. Clark, Echinodcrm fauna of Australia, 1946, 

 p. 54 (key to the Australian species). 



Diagnosis. — A genus of Calometridae in which the arms are 15-40 in number, 

 all the division series being 2; the radials are extended intcrradially in the form of 

 more or less broad interradial processes which entirely and usually rather widely 

 separate the bases of the IBri; the ossicles of the division series are narrow with no 

 lateral extensions; the division series always make a wide angle with the dorsoventral 

 axis; and the longest oral pinmdes are much longer than the shorter genital pinnules. 



Geographical range. — From the Andaman Islands and the western coast of 

 Australia to the Philippine Islands, and northward to southern Japan as far east as 

 Tokyo Bay. 



Bathymetrical range. — From 20 to 600 meters. 



Thermal range. — From 13.28° C. to 15.89° C; but there are only 3 records all of 

 which refer to a single species. 



History. — The generic name Neometra was first used in the description of Neo- 

 metra sibogae published on April 23, 1912. Later in the same year, on November 22, 

 the genus Neometra was formally diagnosed, and Antedon multicolor A. H. Clark, 

 1907, was given as the genotype. There has been no change in the status of the genus 

 since that date. 



KEY TO THE SPECIES IN THE GENUS NEOMETRA 



a'. Dorsal processes on the outer cirrus segments triple, consisting of a median carination with 



a dorsolateral keel on each side of it; usually about 40 arms. 



6'. Cirri XVII-XIX, 39-50, very stout, 35-45 mm. (usually about 40 mm.) long; dorsolateral 



processes but little shorter and lower than the median keel, developed from the fifteenth 



segment onward; division series, brachials, and cirrus segments with unmodified distal 



edges, so that the animal appears smooth (west coast of Australia; 146-219 meters). 



gorgonia (p. 356) 



6". Cirri XV, 31-36, rather slender, about 25 mm. long (one-third of the arm length) ; dorsolateral 



processes much lower than the median keel, developed only toward the tip of the cirrus; 



division series with everted borders and cirrus segments and brachials with produced distal 



edges, giving the animal a very rough aspect (Lesser Sunda Islands; 113 meters). 



sibogae (p. 358) 



