55g BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



references). — Tobtonese, Natura, Milano, vol. 24, 1933, pp. 163, 164 (depth range).— 

 Rivera, Trab. Inst. Esp. Oceanogr., Madrid, No. 10, 1934, p. 83 (Xauen stas. 7, 19, 

 20).— BuEX, Trab. Inst. Esp. Oceanogr., Madrid, No. 6, 1934, p. 27; Bol. Soc. Esp. Hist. Nat. 

 Madrid, vol. 34, 1934, pp. 440, 442, 443 {Xauen sta. 7).— Pallary, Bull. Soc. Hist. Nat. 

 Afrique Nord, vol. 20, pt. 2, 1935, p. 58. — Tobtonese, Ann. Mus. Civ. Stor. N;it. Gcnova, vol. 

 57 1935, p. 222 (listed), p. 265 (proportions; range); Atti Soc. Ital. Sci. Nat., vol. 75, 1936, 

 p. 280. — Perrieb, La faune do la France, vol. I A, Paris, 1936, p. 95 (color; description). — Kolos- 

 VART, Folia zool. hydrobiol. Riga, vol. 9, 1936, p. 83; Festschr. fiir Embrik Strand, vol. 2, 1937, 

 p. 469 (not taken by Najade Exped.). — Tortonese, Boll. Mus. zool. Univ. Torino, vol. 46, ser. 

 3, No. 82, 1938, p. 5 (listed), p. 46 (synonymy; range).— .Jagersten, Nova Acta Reg. Soc. Sci. 

 Upsaliensis, ser. 4, vol. 11, No. 8, 1940, p. 13.— Bacci, Publ. Staz. Zool. Napoli, vol. 20, 1947, 

 p. 174 (bottom communities of the Gulf of Genoa).— GiSLfix, Goteborgs Handels Tidning, ser. 

 B, vol. 5, No. 10, 1947, pp. 3, 4. — Cc^not, in Grassd, Trait6 de Zoologie, vol. 11, 1948, pp. 71, 

 274.— Tortonese, Bull. Inst. Oceanogr. Monaco, No. 956, 1949, p. 4 (depth range), pp. 15, 16 

 Gisted).— Dieuzeide, Bull. Stat. Aquic. P6che, Castiglione, new ser., No. 2, 1950, p. 22 (very 

 abundant locally).— Vatova, Nova Tbalassia, vol. 1, No. 3, 1950, pp. 26, 63, 89 (ecology in 

 Adriatic), table 32.— Tortonese, Atti Accad. Ligure, vol. 8, 1952, pp. 8, 9, 10 (distribution in 

 Ligurian Sea). — PfiRfes and Picard, Compt. Rend. Acad. Sci., vol. 238, 1954, pp. 1252-54 (locally 

 abundant). — Hyman, The invertebrates, vol. 4, Echinodermata, 1955, p. 115 (local aggregations), 

 p. 117 (myzostome parasite). — ^Tortonese, Bull. Stat. Aquic. P6che, Castiglione, new ser., 

 No. 7, 1955, pp. 204, 209. — Chebbonnieb, Les ^chinodermes, Monte Carlo, 1955, p. 94.— 

 Tortonese, Ann. Mus. Civ. Stor. Nat. Genova, vol. 68, 1956, p. 182 (localities).— Cherbonnier, 

 Bull. Stat. Ocfenogr. Salammbo, No. 53, 1956, p. 4 (hsted), p. 8 (sta. 5; occurrence off Tunisia). — 

 Gautier-Michaz, Ann. Inst. Oceanogr., Paris, new ser., vol. 34, 1958, pp. 146, 148 (Calypso 

 stations), pp. 149, 155.— Gautier, Rec. Trav. Sta. Mar. Endoume, No. 26, 1959, p. 143 (Gyf 

 station). — Zavodnik, Biol. Vestnik, Ljubljana, vol. 8, 1961, p. 49 (Adriatic, 100-150 meters). 

 ArUedon adriatica, (not of A.H.C.), Boone, Bull. Vanderbilt Mar. Mus., vol. 4, 1933, pp. 69-70 (-Iro 

 stations), pi. 26. 



Diagnostic features. — See key. 



Description. — The centrodorsal is sharply to bluntly, rounded, or truncated 

 conical, or even somewhat columnar, usually about as high as broad at the base, 

 sometimes higher than broad, with the distal third or half without functional cirrus 

 sockets, shallowly pitted, with a very irregular surface, or bearing numerous papillae. 

 The cirrus sockets, which are elongate dorsoventrally, are arranged in 2, or 2 and a 

 more or less developed third, usuallj' somewhat irregular columns beneath each radial, 

 and are usuall}' closely crowded. 



The cirri are XXV-XXXV, 45-51, up to 61 mm. in length, long, slender, and 

 laterally compressed, in the distal portion tapering gradually to a fine point. In the 

 proximal portion they are curved slightly ventrally, and in the outer half they turn 

 very gradually dorsally. The first segment is about 4 times as broad as long, the second 

 is not quite twice as broad as long, the third is about as long as broad, the fourth is 

 half again as long as broad, the fifth is twice as long as broad, and the seventh and 

 following are from 2 to 3 times as long as broad, the length decreasing slightly at the 

 middle of the cirrus, then gradually increasing again in the terminal fourth. In the 

 outer half of the cirri the dorsal profile of the segments is very slightly concave. There 

 are no dorsal processes, and the opposing spine is absent. The terminal claw is not 

 quite so long as the penultimate segment, and is slightly recurved in the distal half. 

 The more distal cirri are shorter, with fewer and shorter segments. In an extreme 

 case mentioned by Carpenter the longest cirrus measured 61 mm. and consisted of 48 

 segments while an apical cirrus was only a trifle over 5 mm. long. 



The radials are very short, sometimes almost entirely concealed by the centrodorsal, 



