646 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



Most of the specimens were infested with Myzostomum, usually on the disk. 



The color in life was described as mustard yellow. 



Locality.- Discovery Investigations station 160; near Shag Rocks (lat. 5343'40" 

 S., long. 4057' W.) ; 177 meters; at 170 meters, temperature 1.42 C., salinity 34.22% ; 

 gray mud, stones and rock; February 7, 1927 [John, 1938] (11, B.M., six males and 

 five females). 



Subfamily BATHYMETRINAE 



Bathymetrinae A. H. CLARK, Proc. Biol. Soc. Washington, vol. 22, 1909, p. 177 (includes Bathymelra 

 and Thaumatomelra) ; Crinoids of the Indian Ocean, 1912, p. 6 (distribution of species included), 

 p. 26 (range in detail; 80-2900 fms.), p. 61 (in key); Bull. Inst. Oceanogr. Monaco, No. 294, 



1914, pp. 7-8 (temperature relations); Internat. Rev. gesamt. Hydrobiol. und Hydrogr., 1914, 

 pp. 6 and following (Atlantic and corresponding Indo- Pacific genera); Journ. Washington Acad. 

 Sci., vol. 4, No. 19, 1914, pp. 559-563 (correlation of geographical and bathymetrical ranges); 

 No. 20, p. 582 (relation to temperature of habitat) ; vol. 5, No. 4, 1915, pp. 126-134 (bathymetrical 

 range; phylogenetic and paleontological significance); Die Crinoiden der Antarktis, 1915, p. 146 

 (diagnosis; geological, geographical, bathymetrical and thermal ranges; species of this subfamily 

 in some ways resemble the young of the species of Heliometrinae) ; Amer. Journ. Sci., vol. 40, 



1915, p. 68 (detailed discussion of bathymetrical range) ; Journ. Washington Acad. Sci., vol. 7, 

 No. 5, 1917, p. 128 (includes Orthomeira, Tonrometra, Fariometra, Trichometra, Hathrometra, 

 Nepiometra, Phrixometra, Thaumatometra and Bathymetra) ; No. 16, p. 505 (in key), p. 510 (key 

 to the included genera); Unstalked Crinoids of the Siboga-Exped., 1918, p. VIII (3 new species of 

 Psathyromelra almost bridge gap between this subfamily and Zenometrinae), p. 197 (in key), 

 p. 244 (key to the included genera).- MORTENSEN, Wiss. Ergebn. schwed. Siidpolar-Exped. 

 1901-1903, vol. 6, Lief. 8, Crinoidea, 1918, p. 17. A. H. CLARK, Univ. Iowa Studies in Nat. 

 Hist., vol. 9, No. 5, 1921, p. 12 (represented in the West Indies) ; Smithsonian Misc. Coll., vol. 72, 

 No. 7, 1921, p. 2. GISLEN, Nova Acta Reg. Soc. Sci. Upsaliensis, ser. 4, vol. 5, No. 6, 1922, 

 pp. 10, 139, 140, 144, 147. A. H. CLARK, The Danish 7ngoZ/-Exped., vol. 4, No. 5, Crinoidea, 

 1923, p. 49 (in key), p. 53 (key to Atlantic genera). GISLEN, Ark. Zool., vol. 15, No. 23, 1923, 

 p. 15; Zool. Bidrag Uppsala, vol. 9, 1924, pp. 88, 91 (articulations), p. 232 (characters), p. 184 

 (no side and covering plates). MORTENSEN, Handbook of the echinoderms of the British Isles, 

 1927, p. 26 (in key). A. H. CLARK, Journ. Linn. Soc. (Zool.), vol. 36, 1929, p. 662; Ann. Mag. 

 Nat. Hist., ser. 10, vol. 10, No. 58, 1932, p. 383; Proc. U.S. Nat. Mus., vol. 83, 1936, p. 248 

 (Boleometra and Retiometra, genera nov.); Sci. Rep. Australasian Antarctic Exped. 1911-14, 

 vol. C8, pt. 4, 1937, p. 5. JOHN, Discovery Reports, vol. 18, 1938, pp. 123, 124, 164. GISLEN, 

 Lunds Univ. Aarsskr., new ser., Avd. 2, vol. 34, No. 17 (Kungl. Fysiograf. Saalsk. Handl., N.F., 

 vol. 49, No. 17), 1939, p. 10. A. H. CLARK, Mem. Soc. Cubana Hist. Nat., vol. 14, No. 2, 1940, 

 p. 141 (in key). GISLEN, Rep. Swedish Deep Sea Exped., vol. 2, Zool., No. 4, 1951, p. 55 (depth 

 range) . 



Batymetrinae GISLEN, Nova Acta Reg. Soc. Sci. Upsaliensis, ser. 4, vol. 5, No. 6, 1922, p. 10. 



Diagnosis. A subfamily of Antedonidae in which the cirrus sockets are arranged 

 in alternating transverse rows or are closely and irregularly crowded on a conical to 

 hemispherical or even almost discoidal centrodorsal; the cirri are weU developed, but 

 never very long or very stout, with rarely more than 45 (usually 15 to 35) segments, of 

 which the longer proximal ones are always longer than wide and may be up to 6 times 

 as long as wide; the distal segments are shorter and tend to be carinate dorsaUy, usually 

 bearing more or less prominent dorsal spines ; P! is always stiffened, but very slender, and 

 is composed for the most part of much elongated segments, often constricted in the 

 middle and flared and spinous at their distal ends ; P 2 is usually shorter than P, but may 

 be similar to it or even longer and with or without a gonad; it usually resembles P 3 ; 

 all of the pinnules are invariably present, and the genital pinnules may bear a 

 marsupium. 



