86 BULLETIN 82, irMTED STATES NATIONAL MUSEUM VOLUME 1 



Genus IRIDOMETRA A. H. Clark 

 Antedon (part) A. H. Clark, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 340. 

 Iridometra A. H. Clauk, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 130 (diagnosis; type species 

 Antedon adrcsline A. H. Clark, 1907), p. 136 (referred to the Antedonidae) ; Proc. U.S. Nat. Mus., 

 vol. 34, 1908, p. 211 (referred to the Antedonidae, restricted), p. 212 (occurs in Japan and Hawaii 

 [the latter refers to Argyrometra]) ; Geogr. Joum., vol. 32, No. 6, 1908, p. 602 (characteristic of the 

 Indo-Pacific-Japanese region); Amer. Nat., vol. 42, No. 500, 1908, p. 541 (only knovn\ from the 

 Indo-Pacific-Japanese area); No. 503, p. 725 (color); vol. 43, 1909, p. 254 (represented in the Red 

 Sea [refers to Doromcira]) ; Proc. U.S. Nat. Mus., vol. 36, 1909, pp. 362, 366, (comparison with 

 Comatilia), p. 365 (single opposing spine); Proc. Biol. Soc. Washington, vol. 22, 1909, p. 176 

 (referred to the Antedoninae); Mem. Australian Mus., vol. 4, 1911, p. 725 (absent from .\ustralia) ; 

 Crinoids of the Indian Ocean, 1912, p. 9 (absent from Australia), p. 12 (represented in the Red 

 Sea and southeast African region [both refer to Doromelra]) , p. 25 (range), p. 63 (in key), p. 230 

 (original reference; type); Zittel- Eastman's Paleontology, 1913, p. 237 (in the Antedonidae); 

 Joum. Washington Acad. Sci., vol. 7, 1917, No. 5, p. 127 (referred to the Antedoninae); No. 16, 

 p. 506 (in key; geographical and bathymetrical range); Unstalked crinoids of the Sihooa-Exped. , 

 1918, p. 198 (in key; range), p. 212 (key to the included species). — GisLi;N, Nova Acta Reg. Soc. 

 Sci. Upsaliensis, ser. 4, vol. 5, No. 6, 1922, pp. 130, 131, 132; Zool. Bidrag Uppsala, vol. 9, 1924, 

 p. 36. — A. H. Clark, Journ. Linn. Soc. (Zool.), vol. 36, 1929, pp. 659, 660 (/. maxiina sp. nov.). 



Diagnosis. — A genus of Antedoninae in which P,, P2, and P3 are similar and of 

 approxiniatcl}' equal length, longer tiian the genital pinnules, and composed of at least 

 13 segments; the pinnules are not especialh' stiffened and their component segments 

 do not bear prominent spines on their distal ends; the centrodorsal is low liemispherical. 



Type species. — Antedon adrestine A. II. Clarlv, 1907. 



Geographical range. — From soutliern Japan southward to Hong Kong, Timor, and 

 (?) the Admiralty Islands. 



Bathymetrical range. — From 80 to 731 meters. 



KEY TO THE SPECIES OF IRIDOMETRA 



a'. Pi with 14-20 segments when the arms are not more than 55 mm. long (Korean Strait and Japan 



to Hong Kong; 80-731 meters) adrestine (p. 86) 



o'. Pi with not more than 14 segments, even when the arms are 95 mm. in length (Timor; 183 meters; 

 (7) Admiralty Is.; 274 meters) maxima (p. 90) 



IRIDOMETRA ADRESTINE (A. H. Oark) 

 [See vol. 1, pt. 2, figs. 301 (p. 221), and 328 (p. 227)] 



Antedon adrestine A. H. Clark, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 340 (description; 

 Albatross Sta. 3713), p. 353 (listed); Bull. Mus. Comp. Zool., vol. 51, No. 8, 1908, p. 241 (rela- 

 tionship to A. [Andrometra] psyche). 



Iridometra adrestine A. H. Clark, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 131 (listed); Proc. 

 U.S. Nat. Mas., vol. 34, 1908, p. 318 (Japan); vol. 39, 1911, p. 559 (compared with /. melportiene) ; 

 Crinoids of the Indian Ocean, 1912, p. 230 (synonymy; southern Japan, 45-48 fms.); Journ. 

 Washington Acad. Sci., vol. 5, No. 6, 1915, p. 215 (southern Japan species; range and its sig- 

 nificance); Unstalked crinoids of the Sihoga-Exped., 1918, p. 212 (in key; range; references). — 

 Gisl£n, Nova Acta Reg. Soc. Sci. Upsaliensis, ser. 4, vol. 5, No. 6, 1922; pp. 132, 133 (com- 

 parison Tvith /. melpomene) ; y id. Medd. Nat. Foren. K0benhavn, vol. 83, 1927, p. 3 (Mortensen's 

 Stas. 19, 21, 25; 36-216 meters), p. 46 (Stas.; notes), p. 69 Gisted). 



Iridometra melpomene A. H. Clark, Proc. U.S. Nat. Mus , vol. 39, 1911, p. 5.59 (Albatross Sta. 5311); 

 Crinoids of the Indian Ocean, 1912, p. 230 (synonymy; Philippines; 88 fms.); Unstalked cnnoids 

 of the S»5offo-Exped., 1918, p. 212 (in key; range; references; parasitic amphipod).— Shoe.makkr, 

 Proc. Biol. Soc. Washington, vol. 32, 1919, p. 245 (description of Laphystiopsis iridomelrae, a 

 new parasitic amphipod from tliis species).— Gisl£n, Nova Acta Reg. Soc. Sci. Upsaliensis, 

 ser. 4, vol. 5, No. 6, 1922, p. 5 (Sagami Bay, 182-728 m.), p. 132 (localities; notes), p. 181 (listed); 



