120 BULLETIN 82, UNITED STATES NATIONAL MUSEUM 



of the Siboga expedition published in 1918 lusitanica was inserted in the key to the 

 species of Thalassometra, and the synonymy and range were given. In my memoir 

 mi the crinoids of the IngolJ expedition published in 1923 Siiremetra lusitanica was 

 included and the range was given. This information was repeated by Dr. Th. Mor- 

 tensen in 1927 in his work on the echinoderms of the British Isles, and by Prof. Augusto 

 Nobre in 1931 and 1938 in his book on the echinoderms of Portugal. 



STIREMETRA BREV1RADIA (P. H. Carpenter) 



[See vol. 1, pt. 1, figs. 486, 487, p. 365; pt. 2, pi. 2, figs. 975-978, pi. 44, fig. 1301.] 



Antedon radiospina von Graff, Bull. Mub. Comp. Zool., vol. 11, No. 7, 18S3, p. 133 (nomen nudum; 

 Challenger station 170; myzostomes); Challenger Reports, Zoology, vol. 10, pt. 27, 1884, pp. 17, 

 19 (same); Challenger Reports, Narrative, vol. 1, pt. 1, 1885, p. 316 (same).— P. H. Carpenter, 

 Challenger Reports, Zoology, vol. 26, pt. 60, 1888, pi. 3, fig. 4, a-c.—A. H. Clark, Proc. U. S. 

 Nat. Mus., vol. 34, 1908, p. 491 (listed). 



Antedon eversa P. H. Carpenter, Challenger Reports, Zoology, vol. 26, pt. 60, 1888, pi. 3, fig. 5, a-c — 

 A. H. Clark, Proc. U. S. Nat. Mus., vol. 34, 1908, p. 471 (listed). 



Antedon breviradia P. H. Carpenter, Challenger Reports, Zoology, vol. 26, pt. 60, 18S8, p. 110 (descrip- 

 tion; Challenger stations 170A, 175), pi. 3, figs. 4, a-c, 5, a-c; pi. 11, fig. 5, pi. 19, figs. 1-4, pi. 

 20, figs. 1, 2. — Walther, Einleitung in die Geol. als historische Wiss., 1894, p. 298 (after Car- 

 penter).— Hartlaub, Bull. Mus. Comp. Zool., vol. 27, No. 4, 1895, p. 131 (systematic and 

 bathymotrical relationships). — Hdtton, Index faunae Novae Zcalandiae, 1904, p. 290 (listed). — 

 Hamann, Bronn's Klassen und Ordnungen des Tier-Reichs, vol. 2, Abt. 3, 1907, p. 1578 (listed). — 

 A. H. Clark, Crinoids of the Indian Ocean, 1912, p. 33 (identity). 



Thalassometra breviradia A. H. Clark, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 360 (listed). 



Siiremetra breviradia A. H. Clark, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 15 (listed); Crinoids 

 of the Indian Ocean, 1912, p. 33 (identity), p. 211 (synonymy; locality); Smithsonian Misc. 

 Coll., vol. 61, No. 15, 1913, p. 45 (published references to specimens in the B. M.; Challenger 

 stations 170A, 175); Unstalked crinoids of the Si&oj/a-Exped., 1918, p. 161 (in key; range; refer- 

 ences). 



Antedon variospina (Brit. Mus., MS.) A. H. Clark, Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 

 45 (MS. name found with specimens from Challenger station 170A). 



Diagnostic features. — The brachials beyond the proximal fourth of the arms have 

 long, broad, curved, overlapping spines; the IBr series and lower brachials are smooth 

 dorsally with straight sides, and with the median carination low and broad or obsoles- 

 cent; and the cirri are arranged in 10 definite columns on the ccntrodorsal. The 10 

 arms are about 80 mm. long, and the cirri have 40-50+ segments. 



Description. — The ccntrodorsal is hemispherical or rounded truncated conical with 

 the dorsal pole bearing a number of papillae. The cirrus sockets are arranged in 10 

 i olumns of 2 or 3 each; the columns are in close contact interradially, but are separated 

 in the midradial fine by a V-shaped bare area of which the base, at the rim of the ccn- 

 trodorsal, is about as broad as the adjacent cirrus sockets and the apex lies between the 

 seeoiui or third cirrus sockets from the base. 



The cirri are XV XX, 40-50+; the seventh-tenth segments are longer than broad 

 and those following are shorter with a well marked dorsal spine. 



The radials are scarcely visible. The IBi^ are short and convex with occasional 

 traces of a median ridge or keel, especially in young individuals. The IBr 2 (axillaries) 

 are short and widely hexagonal, projecting proximally into the IBr,; they may show a 

 median low keel in the proximal two-thirds. The elements of the IBr series and first 

 brachials have straight edges and flattened sides. 



