272 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



are rounded and perfectly smooth dorsally, and stout cirri with usually 30-35 or more 

 segments. I said that so far as known the color is always either entirely yellow or 

 entirely violet, never mottled. I remarked that only three Australian specimens 

 are known, two from Bowen and one labeled "South Pacific" that probably came from 

 Australia, and gave the range as from Queensland northward to southern Japan, 

 showing that I considered macrodiscus a synonym of a/ra. I examined the type speci- 

 men of Hartlaub's Antedon a/ra at the Hamburg Museum in 1910 and recorded having 

 seen it in 1912. In my memoir on the crinoids of the Indian Ocean published in 1912 

 I placed macrodiscus under the synonymy of a/ra and gave as the range of the latter 

 Queensland to southern Japan in 0-50 fathoms. In my account of the crinoids 

 collected by the Endeavour off the coast of Western Australia published in 1914 I 

 listed Tropiometra a/ra as an Australian tropical species and recorded and gave notes 

 on two specimens dredged between Geraldton and Fremantle. I remarked that, 

 aside from these two specimens, this species (macrodiscus being considered as distinct) 

 is represented in the museums of the world by only three specimens, two from Bowen, 

 Queensland, brought to Europe by the Godeffroy Company more than fifty years 

 before, and a third from the "South Pacific" brought back by the United States Ex- 

 ploring Expedition. In my account of the crinoids of west Africa published in 1914 

 I recognized afro, and macrodiscus as distinct forms. 



Dr. Hubert Lyman Clark wrote in 1915 that this species was not common at 

 Mer, but a few individuals were found on the extreme outer margin of the southwestern 

 reef -flat. He described their habits and reactions (see Part 2, p. 604). 



In my report upon the unstalked crinoids collected by the Siboga expedition 

 published in 1918, I recorded and gave notes on a specimen dredged between New 

 Guinea and Misool which, I said, agreed with others at hand (the dried specimen 

 from the "South Pacific" and the two from Western Australia) from Australia. 



In 1921 Dr. Hubert Lyman Clark recorded three specimens that he bad found in 

 October 1913 at Mer and gave notes on their occurrence. 



TROPIOMETRA AFRA MACRODISCUS (Hara) 



PLATE 32, FIGURE 169 



[See also vol. 1, pt. 1, fig. 65 (nerves), p. 91; fig. 319 (regenerating cirrus), p. 275; pt. 2, fig. 64 (radial 

 pentagon), p. 33; fig. 279 (pinnules), p. 213; fig. 308 (proximal pinnules), p. 223; fig. 797 (ambu- 

 lacral deposits), p. 372.] 



Antedon macrodiscus HARA, Zool. Mag., Tokyo, vol. 7, No. 81, 1895, p. 115 (description; Misaki, 

 3 fms.). [ANONYMOUS], Journ. Roy. Micr. Soc., 1895, p. 638; Nat. Sci., vol. 8, 1896, p. 10. 

 HAMANN, Bronns Klassenund Ordnungendes Tier-Reichs, vol. 2, Abt. 3, 1907, p. 1580 (listed). 

 A. H. CLARK, Proc. U. S. Nat. Mus., vol. 34, 1908, p. 481 (related to Antedon a/ra; remarkable 

 length of the lower pinnules). KIRK, Proc. U. S. Nat. Mus., vol. 41, 1911, p. 101, footnote (pre- 

 ponderance of females over males). HARA and OKADA, Annot. Zool. Jap., vol. 10, art. 4, 1921, 

 p. 33 (host of Myzostoma ijimai, new species). GISLEN, Nova Acta Reg. Soc. Sci. Upsaliensis, 

 ser. 4, vol. 5, No. 6, 1922, p. 9 (placed as a variety under Tropiomelra a/ra). 



Tropiometra macrodiscus A. H. CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 349 (listed) ; 

 Proc. U. S. Nat. Mus., vol. 34, 1908, p. 316 (considered as a synonym of a/ra). H. L. CLARK, 

 Bull. Mus. Comp. Zool., vol. 51, No. 11, 1908, p. 279 (Misaki; about 450 mm. in diameter; 

 uniform deep yellow). A. H. CLARK, Smithsonian Misc. Coll., vol. 60, No. 10, 1912, p. 28 

 (Misaki, 30-50 fms.; color; not a synonym of a/ra); Rec. Western Australian Mus., vol. 1, pt. 3, 

 1914, p. 125 (comparison with T. a/ra); Beitrage zur Meeresfauna Westafrikas, Echinod. II, 

 Crinoidea, 1914, p. 312 (range); Journ. Washington Acad. Sci., vol. 5, No. 6, 1915, p. 214 (range 



