132 BULLETIN 82, UNITED STATES NATIONAL MUSEUM VOLUME 1 



p. 55 (in key). GISLEN, Zool. Bidrag Uppsala, vol. 9, 1924, p. 11 (arm ending; abnormal P,), 

 p. 12 (abnormal arm; hexamerous specimen), pp. 20, 21, 27, 28, 29, 32, 39, p. 41 (measurements) 

 pp. 42, 44, 46, 53, 73, 74, 76, 80, 194, 223, 271 (notes on biology), pp. 273, 275, 276 (food), pp 

 278, 279, 283, p. 285 (Kristineberg, Sweden; 30-40 meters; details), p. 286, figs. 6, 7, 19, 45, 56- 

 58, 332-337. MORTENSEN, Danmarks Fauna, No. 27, 1924, pp. 23, 24 (description; distribution), 

 fig. 4 (pentacrinoid), fig. 10 2 ; Skr. Norske Vid. Selsk. Trondhjem for 1923, No. 3, 1925, pp. 16, 19. 

 KOEHLBB, Les e'chinodermes des mers d' Europe, II, 1927, p. 123 (in key), pp. 125, 126 (refer- 

 ences; description; distribution). -MOBTENSEN, Handbook of the echinoderms of the British 

 Isles, 1927, p. 13 (eggs and young larvae), p. 30 (diagnosis; habits; parasites; range; remarks); 

 fig. 5, p. 15 (myzostomes) ; fig. 12, p. 27 (cirrus); fig. 13, p. 28 (part of arm); fig. 17, p. 31 (pen- 

 tacrinoids). MORTENSEN and LIEBERKIND, Die Tierwelt der Nord- und Ostsee, Lief. 12, 1928, 

 p. viii. 4 (in key), p. viii. 55 (a boreo-lusitanian species), p. viii. 56 (range in detail), p. viii. 86 

 (food and feeding habits), p. viii. 87 (food), p. viii. 107 (free eggs; spawning period; size of 

 eggs), p. viii. 124 (Loxosoma); fig. 2, 2, p. viii. 3 (cirrus); fig. 3A,C, p. viii. 4 (part of arm with 

 genital pinnules); fig. 90, p. viii. 51 (distribution); fig. 114, p. viii. 112 (two pentacrinoids). 

 LIEBERKIND, Zoology of the Faroes, pt. 60, Echinoderma, 1929, p. 1 (localities). LONNBERG 

 and HELLSTROM, Ark. Zool., vol. 23, No. 15, 1932, p. 15 (carotenoid pigments). DJAKONOV, 

 Les Echinodermes des mers arctiques (in Russian), Leningrad, 1933, p. 22 (in key), p. 24 (char- 

 acters; range), fig. 12A, p. 25. GISLEN, Kungl. Fysiogr. Sallsk. Lund Fiirh., new ser., vol. 45, 

 No. 11, 1934, p. 18. LONNBERG, Ark. Zool., vol. 26, No. 7, 1934, pp. 10, 11 (pigments). EK- 

 MAN, Tiergeographie des Meeres, 1935, p. 156. KOLOSVART, Folia zool. hydrobiol. Riga, vol. 9, 

 1936, p. 83 (in Hungarian National Museum). MORTENSEN, Kongl. Danske Vid. Selsk. Skr., 

 nat. math., ser. 9, vol. 7, No. 1, 1937, p. 61 (larva compared with that of Tropiomctra audouini). 

 KOLOSVART, Festschrift fur Embrik Strand, vol. 2, 1937, p. 469; Zool. Anz., vol. 121, 1938, p. 47, 

 fig. 2 (centrodorsal in side view). TERSLIN, Vid. Medd. Nat. Foren. K0benhavn, vol. 102, 1938, 

 p. 15 (named by Heding; new record from southern Kattegat, first from Danish waters), p. 16, 

 fig. 1 (cirrus). GISLEN, Lunds Univ. Arsskr., new ser., Avd. 2, vol. 40, No. 8, 1944, p. 80. 

 LE DANOIS, Les profundeurs de la mer, Paris, 1948, pp. 115, 245. CUENOT in GrassS, Traitfi de 

 zoologie, vol. 11, 1948, p. 54. EINARSSON, The zoology of Iceland, vol. 4, pt. 70, 1948, p. 4 

 (range; notes), p. 48 (member of boreal littoral-sublittoral fauna), p. 53 (lecithotrophic pelagic 

 larvae), pp. 58, 61 (distribution). MORTENSEN in Braestrup, Vort Lands Dyreliv, Copenhagen, 

 vol. 2, 1950, p. 134. -TORTONESE, Atti Accad. Ligure, vol. 8, 1952, p. 9. HYMAN, The inver- 

 tebrates, vol. 4, Echinodermata, 1955, p. 46 (carotenoid pigment), p. 105 (temperature tolerance), 

 p. 106 (food and feeding behaviour), p. 115 (occurrence in aggregations), fig. 42 (ciliary currents 

 of disk). GISLEN, Atlantide Rep., No. 3, 1955, p. 89 (short description); pi. 1, fig. 1, pi. 2, fig. 5. 



Antedon (Alecto) petasus GRIEG, Bergens Mus. Aarsb. for 1888, No. 2, 1889, p. 3 (Moster). 



Anledon rosacea (part) AURIVILLIUS, Bihaug till k. Svensk. Akad. Handl., vol. 24, Afd. 4, No. 3, 

 1898, p. 11 (Kristineberg; breeding season). 



Diagnostic features. P 2 is intermediate in length between P! and P 3 , and resembles 

 PI; there are not more than 18 cirrus segments, of which the outer are moderately 

 compressed laterally and in lateral view are broader than the proximal; the longer 

 proximal segments are about half again as long as broad, the sixth and following 

 gradually decreasing in length to the last, which is about as long as broad; there are 

 usually more than XL cirri ; there are no interradial perisomic plates ; the brachials are 

 usually almost cylindrical, not markedly flared or convex in lateral view. 



[NOTES BY A. M. C.] Judging from the few Scandinavian specimens in the Brit- 

 ish Museum, the relationship of PI, P 2 , and P 3 is not invariable, one specimen from 

 Norway, at least, has P 2 the same size as, or not more than 0.5 mm. longer than, the 

 corresponding P 3 . 



The British Museum specimens and Mortensen's figure (1924 and 1927) indicate 

 that the dorsoventral widening of the cirri in their outer part is usually less marked 

 than in bifida (see fig. 13a, p. 198). 



