PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 415 



stituents); Paper 124, 1922, p. 19 (inorganic constituents). — A. H. Clark, The Danish Ingolf- 

 Exped., vol. 4, No. 5, Crinoidea, 1923, p. 42. — Mortensen, Handbook of the echinoderms of the 

 British Isles, 1927, p. 37 (North Pacific).— A. H. Clark, Explorations des mers de I'U.R.S.S., 

 vol. 23, 1937, p. 219 (Gagara stations 204, 233, 246; Rossinante station 74; Albatross stations 5021, 

 4997, 5017, 4992, 4991, 4993, 4986, 4983, 4982, 4861, 4860; Nadejnyi stations 48, 49, 57, 58, 64; 

 off Gashkevich Baj'; coast of Korea; off Pusan, Korea; eastern Asia; ?Hirado Strait; geographical, 

 bathymetrical and thermal ranges; in Russian), p. 225 (same, in English). — Vinoqradov, Mem. 

 Sears Found. Mar. Res., vol. 2, 1953, p. 256 (skeletal composition). 



Heliomelra II. L. Clark, Mem. Austrahan Mus., vol. 4, 1909, p. 525 (association of two species in the 

 Japan Sea). 



Heliometra eschrichtii maxima H. L. Clark, Mem. Australian Mus., vol. 4, 1909, p. 525 (association 

 with H. hrachymera in the Japan Sea). 



Heliometra glacialis brachymera A. H. Clark, Journ. Washington Acad. Sci., vol. 5, No. 6, 1915, p. 

 213 (very closely related to H. glacialis), p. 215 (Japanese Arctic fauna; bathymetrical and thermal 

 ranges and their significance). 



Heliometra eschrichtii var. maxima von Hofsten, Kungl. Svenska Vet.-Akad. Handl., vol. 54, 1915, 

 p. 12 (range), p. 235 (size). 



Helometra glacialis var. maxima A. H. Clark, Explorations des mers de I'U.R.S.S., vol. 23, 1937, 

 p. 229. 



Heliometra glacialis maxima Djakonov, Reports of the Japan Sea Hydrobiological Expedition of the 

 Zool. Inst. Acad. Sci. U.S.S.R. in 1934, pt. 1, 1938, p. 426 (listed; one of the two Arctic species 

 found), p. 429 (on muddy-sandy bottoms), p. 430 (depth; associated with Ophiura sarsi typica), 

 pp. 453, 454 (biocenosis with 0. sarsi), p. 457, pp. 467, 471 (associations), p. 482 (references; 

 distribution; distinction from typical form); also pp. 488-490 and 498 in English summary. — 

 Derjugin and Somova, Invest. Far East Seas U.S.S.R., vol. 1, 1941, pp. 26, 28 (communities in 

 Peter the Great Bay), p. 35 (English summary). — Djakonov, Bull. Pacific Inst. Fish. Oceanogr., 

 Vladivostok, vol. 30, 1949, p. 13 (in key). — Uschakov et al.. Atlas of the invertebrates of the 

 far eastern seas of the U.S.S.R., 1955, p. 203 (distribution), pi. 63, fig. 1. — Baranova, Invest. 

 Far East Seas U.S.S.R., vol. 4, 1957, p. 246 (absent from the Bering Sea). — Djakonov, Baranova, 

 and Saveljeva, Invest. Far East Seas U.S.S.R., vol. 6, 1959, p. 238 (listed). [Note bt 

 A.M.C.] I agree with these Russian authors in considering maxima as a geographic subspecies 

 of glacialis and have accordingly omitted the term "variety" from the heading above. 



Subspecific characters. — There appear to be no tangible differences between this 

 and the typical form except in size, which averages much larger. The arms reach a 

 length of 350 mm. and the cirri a length of 115 mm. as contrasted \vith a ma.ximum, 

 rarely attained, of 265 mm. and 91 mm. in arctic specimens of glacialis glacialis. 



Abnormal specimen. — An example from Albatross station 5017 has 12 arms, due to 

 the e.xistence of two IBr series in one radial area (see vol. 1, part 2, fig. 164, p. 86 and 

 fig. 1348, pi. 54). These two IBr series are closely crowded with their longitudinal 

 a.xes approximately at right angles, the adjacent sides of the IBri projecting consider- 

 ably from the centrodorsal, the opposite sides mainly concealed beneath it. The arms 

 borne by these two IBr series and the arms on the other fom* IBr series are normal in 

 structure; but the outer arm from the left-hand one of the paired IBr scries has the 

 first brachial fused with the a.xiUary of the adjacent IBr series, the second brachial 

 fused \vith the dorsal surface of the first and lower part of the second brachial of the 

 same series, with its pinnule arising from a point over the second brachial of the nor- 

 mal arm, and its first syzygial pair (brachials 3 + 4) fused with the lateral border of 

 the second brachial of the normal arm; the remaining brachials of the two arms are 

 free. 



Localities. —Sea of Okhotsk [A. H. Clark, 1907, 1937]. 



Gagara station 246; Okhotsk Sea (lat. 55°04' N., long. 142°56' E.); 128 meters; 

 bottom temperature — 1.75°C.; Uschakov 1932 [A. 11. Clark, 1937] (1, Leningrad). 



