492 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



p. 2. — Gisi^N, Nova Acta Reg. Soc. Sci. Upsaliensis, ser. 4, vol. 5, No. 6, 1922, pp. 10, 138, 139, 

 140. — A. H. Clark, The Danish Ingolf-Kxped., vol. 4, No. 5, Crinoidea, 1923, p. 7 (.Poliomelra, 

 new genus).— GiSL^M, Ark. Zool., vol. 15, No. 23, 1923, p. 15; Zool. Bidrag Uppsala, vol. 9, 1924, 

 pp. 88, 91, 232, 239. — Mortensen, Handbook of the echinoderms of the British Isles, 1927, 

 p. 26 (in key), p. 32. — A. H. Clark, Journ. Linn. Soc. (Zool.), vol. 36, 1929, p. 661. — Gisl^n, 

 Kungl. Fysiograf. Siillsk. Handl., new ser., vol. 45, No. 11, 1934, p. 53.— A. H. Clark, Proc. U.S. 

 Nat. Mus., vol. 83, 1936, p. 248 (Eometra, new genus); E.xplorations des mers de I'U.R.S.S., 

 vol. 23, 1937, p. 222 (in Russian), p. 229. — John, Discovery Reports, vol. 18, 1938, pp. 123, 124, 

 152 (Kempometra, new genus); Rep. B.A.N.Z. Antarctic Res. Exped. 1929-31, ser. B., vol. 4, 

 pt. 6, 1939, pp. 202-205 (Anisomelra, new genus). — A. H. Clark, Mem. Soc. Cubana Hist. Nat., 

 vol. 14, No. 2, 1940, p. 139, p. 142 (in key), p. 144. — Gisl^n, Rep. Swedish Deep Sea Exped., 

 vol. 2, Zool., No. 4, 1951, pp. 55, 56.— A. H. Clark, Trans. Roy. Soc. South Africa, vol. 33, pt. 2, 

 1952, p. 189 (Cyclnmetra referred to this subfamily). — Tortonese, Ann. Mus. Civ. Stor. Nat. 

 Genova, vol. 08, 1956, p. 182. 



Z(5nometres A. H. Clark, Bull. Mus. Hist. Nat., Paris, No. 4, 1911, p. 257. 



Zenometriden A. H. Clark, Die Crinoiden der Antarktis, 1915, p. 192 (certain genera of this subfamily 

 are characteristic of the Intermediate fauna). 



Diagnosis. — A subfamily of Antedonidae in which the cirri, which are long with 

 numerous, rarely less than 20, segments, are arranged in definite columns, rarely ob- 

 scured, which are sometimes separated into radial groups by interradial spaces; the 

 centrodorsal is conical, sometimes columnar and may be higher than wide, rarely it is 

 low rounded conical; the cirri are usually weakly attached to the centrodorsal; P, usually 

 resembles P2 and has mostly elongated segments; rarely some of the lower pinnules may 

 be absent. 



Geographical range. — I\Jiown from the Antarctic, Southern Ocean, Galapagos Is- 

 lands, to the Queen Charlotte Islands, the Aleutians, the Okhotsk and Japan Seas, 

 southern Japan, the Hawaiian Islands, the East Indies and Philippines, the Indian 

 Ocean and east Africa, southwest Africa, northwest Africa, Madeira, the Mediterranean 

 and Sea of Marmara, Brazil, the West Indies and southeastern United States and from 

 Spain to the Faroe Islands, the southern part of the Barents Sea, the Kara Sea and east 

 and west Greenland. 



Bathymetrical range.— Ivaown from 20 to 3426 meters. 



Thermal range.— From —1.97° [? — 2.10°] to -1-18.2° C. 



Remarks [by A.M.C.]. — Of the fourteen genera now included in this subfamily, six 

 are monotypic; namelj' Zenometra, Balanometra, Anisomelra, Adelometra, Kempometra 

 and Poliometra. The genus with most species is Psathyrometra with eight, ranging from 

 the Indian Ocean, East Indies and North Pacific. Four genera are Hmited in their 

 distribution to the Antarctic and Southern Oceans; these are Anisometra, Eumorpho- 

 metra, Kempometra and Eometra; Poliometra comes from the cold northern seas. On the 

 other hand Zenometra, Balanometra, Sarametra, Caryometra, Adelometra and Hybomeira 

 are limited to tropical areas with temperatures of not less than 5° C. Psathyrometra 

 seems to occupy the greatest range of temperature, from 0.39° C. to 13.3° C. 



Most of the species hve at depths of well over 200 meters, in fact only four, Ilybo- 

 metra senta, Poliometra prolixa, Leptometra phalangium and L. celtica have been taken 

 at depths of less than 100 meters. 



Characters [by A.M.C.]. — The centrodorsal in this subfamily varies in shape from the 

 extraordinary high columnar form with the apex truncated, found in some specimens of 

 the type species of Zenometra, Balanometra, and Sarametra, through high conical in other 

 specimens of the same species (formerly described under separate names but now 



