210 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



OL1GOMETRA CARPENTERI (Bell) 



PLATE 29, FIGURES 157-160 



Antedon carpenteri BELL, Report Zool. Coll. H. M. S. Alert, 1884, p. 155 (specific formula), p. 157 

 (description; Port Curtis), pi. 10, figs. A, a-c. P. H. CARPENTER, Challenger Reports, Zoology, 

 vol. 26, pt. 60, 1888, pp. 54, 193, 366, 377. A. H. CLARK, Smithsonian Misc. Coll., vol. 50, 

 pt. 3, 1907, p. 353 (listed). HAMANN, Bronns Klassen und Ordnungen des Tier-Reichs, vol. 2, 

 Abt. 3, 1907, p. 1579 (listed). A. H. CLARK, Mem. Australian Mus., vol. 4, 1911, p. 714 

 (identity), p. 716 (credited to Australia by Carpenter); Crinoids of the Indian Ocean, 1912, 

 pp. 31, 33 (identity). 



Antedon milberti (part) BELL, Report Zool. Coll. H. M. S. Alert, 1884, p. 156 (Prince of Wales 

 Channel); Proc. Zool. Soc. London, 1894, p. 394 (northwestern Australia, 8-15 fms.). 



Antedon serripinna BELL, Proc. Zool. Soc. London, 1894, p. 394 (Holothuria Bank, 24 and 39 fms.). 



A. H. CLARK, Mem. Australian Mus., vol. 4, 1911, p. 719 (correction of Bell); Crinoids of the 

 Indian Ocean, 1912, p. 38 (same). 



Oligometra carpenteri A. H. CLARK, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 126 (listed) ; vol. 22, 

 1909, p. 7 (listed), p. 42 (compared with 0. [Decametra] studerf); Amer. Journ. Sci., ser. 4, vol. 32 

 (old ser. vol. 182), No. 188, 1911, p. 130 (significance of distinctive characters); Die Fauna 

 Sudwest-Australiens, vol. 3, Lief. 13, 1911, p. 436 (northwest Australia, 8-15 and 24-39 fms.), 

 p. 441 (Australian tropical species occurring south to Baudin Island and Port Curtis), p. 443 

 (range on east coast), p. 444 (range on west coast), p. 446 (summary of west Australian records) ; 

 Mem. Australian Mus., vol. 4, 1911, p. 717 (known to Carpenter from Australia), p. 722 (occurs 

 south to Port Curtis), p. 723 (northwest Australia; Baudin Island), p. 725 (distinct from serri- 

 pinna but derived from same stock), p. 734 (in key), p. 775 (annotated synonymy; characters; 

 Port Curtis; other records); Crinoidsof the Indian Ocean, 1912, p. 31 ( = Antedon milberti, part, 

 and A. carpenteri Bell, 1884), p. 33 ( = Antedon carpenteri P. H. Carpenter, 1888), p. 38 ( = Antedon 

 milberti, part, and A. serripinna Bell, 1894), p. 174 (synonymy; summary of previous records); 

 Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 37 (published references to specimens in the 



B. M.; localities); Internat. Rev. gesamt. Hydrobiol. und Hydrogr., 1915, p. 225 and following 

 (detailed account of the distribution in Australia) ; Unstalked crinoids of the Siboga-TZxped., 

 1918, p. 129 (in key ; range), p. 130 (references; stations 273, 274), p. 275 (listed), pi. 28, fig. 105. 

 H. L. CLARK, The echinoderm fauna of Torres Strait, 1921, p. 24 (range), p. 192 and following 

 (range in Australia). McNEiLL and LIVINGSTON, Rec. Australian Mus., vol. 15, No. 2, 1926, 

 pp. 193, 195 (Sir Edward Pellew Islands; occurrence). H. L. CLARK, Rec. South Australian 

 Mus., vol. 3, No. 4, 1928, p. 368 (Northern Territory, South Australia). A. H. CLARK, Journ. 

 Linn. Soc. (Zool.), vol. 36, No. 249, May, 1929, p. 646 (Baudin Island; 8-15 fathoms). 

 H. L. CLARK, Great Barrier Reef Expedition, 1928-29, Scientific Reports, vol. 4, No. 7, 1932, 

 p. 202 (station XIV); Echinoderm fauna of Australia, 1946, p. 49 (Australian localities). 



Diagnostic features. P 2 is exceedingly stout, usually curved strongly inward over 

 the disk, composed of segments which, except for one or two of the minute terminal 

 ones, are much broader than long with the edge toward the arm tip produced into a 

 high uniform keel, and a high prominent tubercle or short blunt spine on the distal 

 half on the edge toward the arm base. 



Description. The centrodorsal is thin discoidal with a broad flat or slightly 

 concave dorsal pole 2 mm. in diameter, with slight rounded elevations at the base of 

 each of the cirri. The cirrus sockets are arranged in a single regular and very closely 

 crowded marginal row; they are higher than broad with straight lateral edges, a 

 strongly arched proximal, and a slightly arched distal border. 



The cirri are XV, 15-18, between 5 and 6 mm. long, and are strongly curved. 

 The first segment is very short, the second is between three and four times as broad 

 as long, and those following slowly increase in length so that those in the middle of 

 the cirri are about twice as broad as long and the two or three outermost are about 



