404 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



Antedon mucronata (part) HAMANN, Bronns Klassen und Ordnungen des Tier-Reichs, vol. 2, Abt. 3, 

 1907, p. 1580 (listed). 



Ptilometra macronema A. H. CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 359 (in part; 

 listed); vol. 52, pt. 2, 1908, pp. 225, 226 (compared with P. trichopoda); Proc. Biol. Soc. Wash- 

 ington, vol. 22, 1909, pp. 39-41 (compared with P. dorcadis); Zool. Anz., vol. 34, No. 11/12, 

 1909, p. 363 (Australian species belonging to a tropical genus). H. L. CLARK, Mem. Australian 

 Mus., vol. 4, pt. 11, 1909, p. 525 (all the individuals of Himerometra paedophora were found 

 tightly clinging by their cirri to the pinnules and cirri of the larger specimens of this species), 

 p. 527 (new localities). A. H. CLARK, Ann. Mag. Nat. Hist., ser. 8, vol. 5, 1910, p. 361 (defi- 

 cient side- and covering-plates the rebult of a shallow- water habitat). H. L. CLARK, Biol. 

 Results Fishing Exper. F. I. S. Endeavour, 1909-14, vol. 4, pt. 1, 1916, p. 5 (characteristic of 

 southern Australian subregion), p. 23 (new localities). 



Comatula macronema A. H. CLARK, Bull. Mus. Comp. Zool., vol. 51, No. 8, 1908, p. 245 (genotype 

 of Ptilometra; this is macronema of Carpenter, 1888= australis) . 



Ptilometra mulleri A. H. CLARK, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 41 (new name for the 

 species of Ptilometra found at Sydney if it should prove to be different from the form found at 

 King Georges Haven); Bull. Mus. Hist. Nat., Paris, 1911, No. 4, p. 256 (compared with macro- 

 nema; range), fig. 1A (cirrus of a specimen from Sydney harbor); Fauna Sudwest Australiens, 

 vol. 3, Lief. 13, 1911, p. 437 (history; comparison with macronema), p. 442 (south Australian 

 species occurring north to Port Phillip on the west and Broughton Islands on the east) , p. 443 

 (range in east); p. 449 (range of Comatulella brachiolata does not enter range of this species), p. 

 462 (Himerometra paedophora is the young of this species); Mem. Australian Mus., vol. 4, 1911, 

 p. 717 (known to Carpenter from Australia), p. 718 (history), p. 722 (range), p. 735 (in key), 

 p. 783 (synonymy; characters; localities), p. 785 (remarks); Crinoids of the Indian Ocean, 1912, 

 p. 9 (range), pp. 34, 37 (identity), p. 189 (synonymy; range). F. W. CLARKE and WHEELER, 

 U. S. Geol. Surv. Prof. Paper 90-D, 1914, p. 34 and following (inorganic constituents of the 

 skeleton). A. H. CLARK, Die Crinoiden der Antarktis, 1915, p. 167 (range); Internat. Rev. 

 gesamt. Hydrobiol. und Hydrogr., 1915, p. 226 and following (detailed account of distribution). 

 H. L. CLARK, Biol. Results Fishing Exper. F. I. S. Endeavour, 1909-14, vol. 4, pt 1, 1916, p. 4 

 (range), p. 24 (localities). F. W. CLARKE and WHEELER, U. S. Geol. Surv. Prof. Paper 102, 

 1917, p. 20 and following (inorganic constituents of the skeleton). MORTENSEN, Studies in 

 the development of crinoids, 1920, p. 4 (young carried on the cirri [error for pinnules]; refers to 

 Aporometra paedophora). F. W. CLARKE and WHEELER, U. S. Geol. Surv. Prof. Paper 124, 

 1922, p. 17 (inorganic constituents of the skeleton). GISLEN, Zool. Bidrag Uppsala, vol.9, 

 1924, p. 28, footnote 1, 79, 194, fig. 175, p. 98 (articulation of P 4 ); Kungl. Fysiogr. Sallsk. 

 Handl., new ser., vol. 45, No. 11, 1934, p. 25. POPE, Australian Mus. Mag., vol. 8, No. 12, 

 1945, pp. [iii], 407, fig. on cover. H. L. CLARK, Echinoderm fauna of Australia, 1946, pp. 55, 

 56 (history). 



Ptilometra muelleri A. H. CLARK, Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 43 (references to 

 specimens in the B. M.; localities). 



Ptilometra australis (A. H. Clark, in lilt.} H. L. CLARK, Echinoderm fauna of Australia, 1946, p. 55 

 (localities) . 



Diagnostic features. -This species is more delicate and slender than P. macronema; 

 the centrodorsal is less thickened and columnar with the cirrus sockets less regularly 

 arranged; the cirri are shorter and more slender, especially distally, with short proxi- 

 mal segments of which the longest in fully developed individuals are about twice as 

 broad as long, though in small ones they may be nearly or quite as long as broad; 

 the proximal pinnules are more slender and shorter, and all the pinnules have pro- 

 portionately considerably shorter segments. 



Description of a specimen from Sydney (see Part 2, pi. 53, fig. 1356; U.S.N.M., 

 17863). The centrodorsal is short columnar, 7 mm. broad at the base, 6.5 mm. 

 broad at the dorsal pole, and 4 mm. high. The cirrus sockets are arranged in 20 



