PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 691 



ooze; December 30, 1873 [P. H. Carpenter, 1887, 1888; A. H. Clark, 1913; Vaney and 

 John, 1939] (2& B.M.). Type locality. 



Scotia, March 18, 1903 ; SE.of the South Orkney Islands, Weddell Sea Oat. 6210' S. 

 long. 4120' W.); 3426 meters [Vaney and John, 1939] (2, Edinburgh M.). 



Genus BATHYMETRA A. H. Clark 



Antedon (part) P. H. CARPENTER, Proc. Roy. Soc., vol. 28, 1879, p. 384, and following authors. 



Balhymetra A. H. CLARK, Proc. Biol. Soc. Washington, vol. 21, 1908, p. 132 (diagnosis; type species 

 Antedon abyssicola P. H. Carpenter, 1888), p. 136 (referred to the Antedonidae) ; Amer. Nat., 

 vol. 42, 1908, No. 500, p. 542 (characteristic oceanic genus) ; No. 503, p. 718 (only comatulid beyond 

 2000 fms.), p. 725 (color); Geogr. Journ., vol. 32, No. 6, 1908, p. 603 (oceanic genus), p. 604 (found 

 beyond 2000 fms.); Proc. U.S. Nat. Mus., vol. 34, 1908, p. 211 (referred to the Antedonidae, re- 

 stricted) ; vol. 36, 1909, p. 366 (radials compared with those of Comatilia) ; Proc. Biol. Soc. Wash- 

 ington, vol. 22, 1909, p. 177 (referred to the Bathymetrinae) ; Proc. U.S. Nat. Mus., vol. 40, 1911, 

 p. 12 (occurs in deep water in the Atlantic, but never intrudes on the territory of the Polar-Pacific 

 species [reference is to Thaumatometra minutissima]) ; Crinoids of the Indian Ocean, 1912, p. 11 

 (occurs both east and west of Ceylon), p. 15 (characteristic of the oceanic fauna; absent from the 

 north Atlantic), p. 26 (range; 1200-2900 fms.; also occurs off the Brazilian coast [Thaumatometra 

 minutissima]), pp. 61, 63 (in key), p. 244 (original reference; type) ; Internat. Rev. gesamt. Hydro- 

 biol. und Hydrogr., vol. 6, 1914, pp. 7 and following (occurs in both Atlantic [refers to Thaumato- 

 metra minutissima] and Indo-Pacific; range and its significance) ; Die Crinoiden der Antarktis, 

 1915, p. 147 (synonymy; range; as here considered included abyssicola, brevicirra, carpenteri, 

 minutissima and a species mentioned by Hartlaub from Panama), p. 182 (both Atlantic [Thaumat- 

 ometra minutissima} and Indo-Pacific; range); Journ. Washington Acad. Sci., vol. 7, 1917, No. 5, 

 p. 128 (referred to the Bathymetrinae); No. 16, p. 512 (in key; range); Unstalked Crinoids of the 

 <Si6oja-Exped., 19 1 8, p. 246 (in key ; range) , p. 253 (key to the included species) . PELSENEER, Bull. 

 Soc. Zool. France, vol. 53, 1928, p. 172 (parasites). GISLEN, Rep. Swedish Deep Sea Exped., 

 vol. 2, Zool., No. 4, 1951, pp. 55, 56. 



Diagnosis. A genus of the Bathymetrinae in which all the cirrus segments but 

 the first one are longer than broad; the cirri are only X-XV in number; the radials 

 are conspicuous, about twice as broad as long; there is no marsupium on the genital 

 pinnules. 



Type species. Antedon abyssicola P. H. Carpenter, 1888. 



Geographical range. Known from south of Australia and from north of Midway 

 Island, North Pacific. 



Bathymetrical range. From 4753 to 5301 meters. 



Thermal range. From 1.05 C. to 1.83 C. 



Remarks [by A.M.C.]. In his previous diagnoses of this genus Mr. Clark wrote 

 that all the cirrus segments are longer than broad. In fact Carpenter's artist omitted 

 the short basal segment from his figures. 



KEY TO THE SPECIES OF BATHYMETRA 



a 1 . Centrodorsal with the cirrus sockets spaced out around its sides; radials nearly horizontal, making 

 a distinct angle with the base of the centrodorsal in side view (west of Tasmania; 4753 meters). 



carpenteri (p. 692) 



o j . Centrodorsal bearing cirri only around the dorsal pole, the basal half being smooth and bare; 

 radials making a continuous curve or a wide angle with the base of the centrodorsal in side 



view (east of Japan; 5300 meters) abyssicola (p. 692) 



556-62267 45 



