PART 5 A MONOGRAPH OF THE EXISTING CRLNOIDS 573 



Genus POLIOMETRA A. H. Clark 



Anlcdon (part) P. II. CARPENTER, in Duncan and Sladen, Ann. Mag. Nat. Hist., ser. 4, vol. 20, No. 

 120, 1877, p. 451, and following authors. 



Hathrometra (part) A. H. CLARK, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 130, and following 

 authors. 



Poliometra A. H. CLARK, The Danish Ingolf-Exped., vol. 4, No. 5, Crinoidea, Sept. 22, 1923, p. 7 

 (diagnosis; type and only species Anledon prolixa Sladen, 1881; range; remarks), p. 42 (range), 

 p. 53 (in key). GISLN, Ark. Zool., vol. 15, No. 23, Oct. 5, 1923, p. 15 (discussion). MORTENSEN, 

 Danmarks Fauna, No. 27, 1924, p. 20, p. 21 (in key) ; Handbook of the echinoderms of the British 

 Isles, 1927, p. 26 (in key), p. 32 (diagnosis). KOEHLER, Les echinodermes des mers d 'Europe, 

 vol. 2, 1927, p. 127. GISLEN, Vid. Medd. Nat. Foren. K0benhavn, vol. 83, 1927, p. 6. A. H. 

 CLARK, Mem. Soc. Cubana Hist. Nat., vol. 14, No. 2, 1940, p. 140. GISLEN, Rep. Swedish Deep 

 Sea Exped., vol. 2, Zool., No. 4, 1951, p. 55. 



Peliomelra DJAKONOV, Trav. Soc. Nat. Leningrad, vol. 56, pt. 2, 1926, p. 107 (in key) ; Les e'chiuodermes 

 des mers arctiques (in Russian), Leningrad, 1933, p. 22 (in key). GORBUNOW, Trans. Arctic 

 Institute, Leningrad, vol. 2, 1932, p. 95 and following (in Russian); vol. 7, 1933, p. 42 and follow- 

 ing; vol. 8, 1933, p. 5 and following. SCHORYQIN, in Gaevskoy, Check list of the fauna and 

 flora of the northern seas of the U.S.S.R., 1948, p. 470. 



Diagnosis. A genus of Zenometriiiae in which the centrodorsal is conical with 

 slightly swollen sides, about as high as broad at the base, its surface not divided into 

 radial areas; in large specimens where the centrodorsal diameter is about 3 mm. the 

 cirrus sockets under each radial are arranged peripherally in 4 columns and apically in 

 3, rarely in 3 columns throughout; the peripheral cirri are long and only slightly curved 

 with 32 to 50 segments, of which the longest are 4 times as long as broad and the outer- 

 most are about twice as long as broad with a small terminal dorsal spine or tubercle; 

 the apical cirri are about a fourth as long as the peripheral with 16 to 28 segments; the 

 elements of the LBr series and lower brachials are narrow, not in lateral contact and 

 without spines; all the pinnules are present; PI with 25 to 45 segments is much elon- 

 gated and very slender, about 3 times as long as P 2 which has 11 to 17; while P 3 with 

 11 to 15 segments may be nearly twice as long as P 2 . 



Type species. Antedon prolixa Sladen, 1881. 



Geographical range. Arctic regions; westward to Grinnel Land; southward to the 

 vicinity of Godthaab, west Greenland, Cape Brewster, east Greenland, the vicinity of 

 Jan Mayen, the cold deeps west, north and east of Iceland, the Faroe Channel, Fin- 

 mark and eastward to Kara Bay and just east of Wilczek Land. 



Bathymetrical range. From 20 to 1960 meters. 



Thermal range. From 1.97 [? -2.10] to +2.0 C. (to +3.0 C. according to 

 Schorygin). 



POLIOMETRA PROLIXA (Sladen) 



FIGURE 33 



[See also vol. 1, pt. 1, fig. 409(p. 317), pi. 1, figs. 519, 523, pi. 3, figs. 532, 535, 538, pi. 4, figs. 542, 544, 

 pi. 6, figs. 559-564; pt. 2, figs. 101(p. 62), 5S4-5S5(p. 303), 775(p. 362), 940(p. 549), pi. 15, figs. 

 1066, 1067, pi. 27, fig. 1170, pi. 34, figs. 1210, 1213, pi. 37, fig. 1227, pi. 56, fig. 1353] 



Antedon celtica (not of Barrett and McAudrew, 1858) P. H. CARPENTER, in Duncan and Sladen, 

 Ann. Mag. Nat. Hist., ser. 4, vol. 20, No. 120, 1877, p. 451 (listed), p. 468 (Discovery Bay, 

 25 frns., hard bottom), p. 469 (distribution [in part]). SLADEH, in Nares, Narrative of a voy- 

 age to the Polar Sea, vol. 2, 1878, p. 281 (Grinnel Land). D'URBAN, Ann. Mag. Nat. Hist., 

 ser. 5, vol. 6, 1880, p. 271. NANSEN, Bidrag til Myzostomernes Anatomi og Histologi, 1885, 

 pp. 3, 6, 7 (Vfiringen sta. 343; myzostomes). 



Antedon sarsii (not of Diiben and Koren, 1846) von MARENZELLER, Denkschr. Akad. Wiss. Wien, 

 vol. 35, 1878, p. 381 (7900' N., 6221' E.; 183 meters). D'URBAN, Ann. Mag. Nat. Hist., 



