A MONOGRAPH OF THE EXISTING CRINOIDS 



693 



Figure 42.— Bathymetra carpenteri A. H. Clark, holotype: a, Centro- 

 dorsal; b, calyx viewed from the other side. 



[fig. 2 = B. carpenteri]. — Bather, Quart. Journ. Geol. See, vol. 45, 1889, p. 154 (interradia 

 projection of radials homologous with petals, spearheads or spines in the Eugeniacrinidae; ex- 

 actly paralleled in many Larviforma). — P. H. Carpenter, Journ. Linn. Soc. (Zool.), vol. 24, 

 1891, p. 59 (considered an embryonic type). — Hartlaub, Nova Acta Acad. German., vol. 58, 

 1891, No. 1, p. 14. — Walther, Einleitung in die Geologie als historische Wiss., 1894, p. 298 

 (after Carpenter). — Thompson, Proc. Roy. Soc. Edmburgh, vol. 22, 1899, p. 321 (evidence in 

 support of the bipolar theory). — A. H. Clark, Smithsonian MLsc. Coll., vol. 50, pt. 3, 1907, p. 

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

 p. 1579 (listed).— A. H. Clark, Proc. U.S. Nat. Mus., vol. 34, 1908, p. 454 (determination of 

 the type locality); Crinoids of the Indian Ocean, 1912, p. 33 (of Carpenter, 1888 = B. abyssicola 

 + B. carpenteri); Smithsonian Misc. Coll., vol. 61, No. 15, 1913, p. 79 (same). — Koehler, Les 

 echinodermes des mers d'Europe, vol. 1, 1924, p. 58 (depth). 

 Bathymetra abyssicola A. H. Clark, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 132 (listed); Proc. 

 U.S. Nat. Mus., vol. 34, 1908, p. 235 (restricted by the description of one of the two specimens 

 as B. carpenteri); Crinoids of the Indian Ocean, 1912, p. 33 {=Antedon abyssicola P. H. Carpen- 

 ter, 1888, in part), p. 244 (synonymy; north Pacific, 2900 fnis.); Smithsonian Misc. Coll., vol. 

 61, No. 15, 1913, p. 66 (published references to the specimen in the B.M.; Challenger sta. 244); 

 Journ. Washington Acad. Sci., vol. 5, 1915, No. 6, p. 215 (Antarctic type; range and its signifi- 

 cance); Die Crinoiden der Antarkti.s, 1915, p. 148 (synonymy; range); Unstalked crinoids of the 

 Siboga-'Exped., 1918, p. 254 (in key; range; references).— Gisl^n, Ark. Zool., vol. 19, No. 32, 

 1928, p. 11 (note). — Tortonese, Natura, Milano, vol. 24, 1933, p. 164.— Gisl£n, Rep. Swedish 

 Deep Sea Exped., vol. 2, Zool., No. 4, 1951, p. 56 (depth). 



Diagnostic features. — The ccntrodorsal has no cirri around the base but around 

 the dorsal pole there are 10 to 15 which are directed vertically in the two known spec- 

 imens; the radials form a continuous curve with the base of the ccntrodorsal and are 

 not very foreshortened in side view; the articulations of the brachials are not unusually 

 free dorsally; the pinnules are unknown. 



Description [by A.M.C.]. — The centrodorsal is probably low hemispherical, but 

 the shape is concealed by the bixses of the cirri which are concentrated aroimd the 

 dorsal pole leaving bare the peripheral half. 



The X-XV cirri are now all broken by the sLxth segment and no detached distal 

 parts remain. Carpenter gave the number of segments as 8 to 10. According to his 



