504 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



(habitat), p. 62 (in key), p. 238 (original reference; type); Internal. Rev. gesamt. Hydrobiol. 

 und Hydrogr., vol. 6, 1914, pp. 5 and following (both Atlantic and Indo-Pacific; range and its 

 significance); Die Crinoiden der Antarktis, 1915, p. 114 (in key), p. 182 (occurs in Atlantic and 

 Indo-Pacific; range); Journ. Washington Acad. Sci., vol. 7, No. 16, 1917, p. 509 (in key; range); 

 Unstalked crinoids of the Siboga-TZxped., 1918, p. 222 (in key; range), p. 233 (key to the included 

 species); Univ. Iowa Studies in Nat. Hist., vol. 9, No. 5, 1921, p. 13 (West Indies and Indo- 

 Pacific), p. 16 (in key); The Danish Ingolf-Exped., vol. 4, No. 5, Crinoidea, 1923, p. 42 (range), 

 p. 53 (in key). EKMAN, Zoogeographica, vol. 2, No. 3, 1934, pp. 328, 343 (zoogeographical 

 significance); Tiergeographie des Meeres, 1935, p. 67. GISLEN, Lunds Univ. Arsskr., new ser., 

 Avd. 2, vol. 40, No. 8, 1944, p. 54, footnote. 



Diagnosis [by A.M.C.].- A genus of Zenornetrinae in which the centrodorsal is 

 conical, almost equal in height to the basal diameter, with two regular columns of 

 cirrus sockets in each radial area separated by naked, shallow interradial grooves; the 

 longest cirri have over 50 segments, of which less than half are longer than broad and 

 the distal ones are very short, each with a prominent dorsal crest; the division series 

 and lower brachials are smooth and cylindrical, those of neighboring series not in 

 lateral contact; the single specimen known is multibrachiate with 14 arms and hence 

 four IIBr series, of which three are of 4 ossicles and the other of 2 ; P D where present 

 is long with the outer half very attenuated; the following three pinnules, PI, P 2 and 

 P 3 , are progressively shorter. 



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



Geographical distribution.- Known only from off the Kei Islands. 



Bathymetrical distribution. Known only from 256 meters. 



Remarks. The genus Adelometra was established in 1907 for Antedon angustiradia, 

 which had been described and figured by Dr. P. H. Carpenter in 1888 and referred by 

 him to his "Savignyii Group" (now the family Himerometridae) because of the presence 

 of 14 arms in the unique type, three of the extra division series being 4(3+4) and one 2. 

 This specimen with its conical centrodorsal and cirrus sockets in vertical columns 

 clearly belongs rather to the subfamily Zenometrinae of the family Antedonidae. 



[NOTE BY A.M.C.] In 1908 Mr. Clark described a new species from off Havana, 

 Cuba, which he called Adelometra tenuipes, but in 1936 he "established a new 

 genus, Caryometra, to accommodate this species. 



ADELOMETRA ANGUSTIRADIA (P. H. Carpenter) 



FIGURE 25 

 [See also vol. 1, pt. 2, pi. 44, fig. 1300] 



Antedon, sp. (part) P. H. CARPENTER, Proc. Roy. Soc., vol. 28, 1879, p. 384 (Challenger sta. 192). 



Antedon angustiradia P. H. CARPENTER, in von Graff, Challenger Reports, Zoology, vol. 10, pt. 27, 

 1884, p. 74 (sta. 192; myzostomes; nomen nudum); Challenger Reports, Zoology, vol. 26, pt. 60, 

 1888, p. 253 (description; sta. 192), pi. 45, fig. 4. BRAUN, Centralbl. Bakteriol. und Parasitenk., 

 vol. 3, 1888, p. 210 (myzostomes). HARTLAUB, Nova Acta Acad. German., vol. 58, No. 1, 1891, 

 p. 16. MINCKERT, Arch. Naturg., 1905, vol. 1, p. 224. HAMANN, Bronn's Klassen ucd Ordnun- 

 gen des Tier-Reichs, vol. 2, Abt. 3, 1907, p. 1582 (listed). 



Antedon angustiradiata MINCKERT, Arch. Naturg., 1905, vol. 1, p. 224. 



Adelometra angustiradia A. H. CLARK, Smithsonian Misc. Coll., vol. 50, pt. 3, 1907, p. 364 (listed); 

 Proc. U.S. Nat. Mus., vol. 34, 1908, p. 236 (compared with A. tenuipes); vol. 35, 1908, p. 119, 

 footnote (arm structure) ; Crinoids of the Indian Ocean, 1912, p. 35 ( = Antedon angustiradia P. H. 

 Carpenter, 1888), p. 238 (synonymy; locality); Smithsonian Misc. Coll., vol. 61, No. 15, 1913, 

 p. 57 (published references to the specimen in the British Museum; Challenger sta. 192); Un- 



