86 BULLETIN 82, UNITED 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. CLARK, Proo. Biol. Soc. Washington, vol. 21, 1908, p. 130 (diagnosis; type species 

 Antedon adrestine 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. Journ., vol. 32, No. 6, 1908, p. 602 (characteristic of the 

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

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

 Sea [refers to Dorometra]) ; 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 Australia) ; 

 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 Dorometra]), p. 25 (range), p. 63 (in key), p. 230 

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

 Journ. 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 erinoids of the Siboga-Exped. , 

 1918, p. 198 (in key; range), p. 212 (key to the included species). GISLEN, 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 (I. maxima sp. nov.). 



Diagnosis. A genus of Antedoninae in which P t , P 2 , and P 3 are similar and of 

 approximately equal length, longer than the genital pinnules, and composed of at least 

 13 segments; the pinnules are not especially stiffened and their component segments 

 do not bear prominent spines on then- distal ends; the centrodorsal is low hemispherical. 



Type species. Antedon adrestine A. H. Clark, 1907. 



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

 (?) the Admiralty Islands. 



Bathymetrical range. From 80 to 731 meters. 



KEY TO THE SPECIES OF IRIDOMETRA 



a 1 . 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) 



a 2 . PI with not more than 14 segments, even when the arms are 95 mm. in length (Timor; 183 meters; 

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



IRIDOMETRA ADRESTINE (A. H. Clark) 



[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. Mus., vol. 34, 1908, p. 318 (Japan) ; vol. 39, 1911, p. 559 (compared with I. melpomene); 

 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 erinoids of the Siboga-Exped., 1918, p. 212 (in key; range; references). 

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

 parison with I. melpomene) ; Vid. Medd. Nat. Foren. K0benhavn, vol. 83, 1927, p. 3 (Mortensen's 

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



Iridometra melpomene A. H. CLARK, Proc. U.S. Nat. Mus , vol. 39, 1911, p. 559 (Albatross Sta. 5311); 

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

 of the iSi&oi/a-Exped., 1918, p. 212 (in key; range; references; parasitic amphipod). SHOEMAKER, 

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

 new parasitic amphipod from this species). GISLEN, 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); 



