PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 351 



Heliomelra (Anledon) quadrata DERJUGIN, Mem. Acad. Sci. St. Petersburg, vol. 34, No. 1, 1915, p. 

 396-398 (localities in the Kola Gulf). 



Heliometra eschrichti KOEHLEB, Les e'chinodermes des mers d'Europe, vol. 1, 1924, p. 60 (depth 

 range). GISLEN, Zool. Bidrag Uppsala, vol. 9, 1924, p. 11 (forked pinnule), p. 28, footnote 1, 

 p. 41 (measurements), pp. 42, 44, 46, 47, 51, 54, 61, 73, 74, 82, 194, 214, 215, 223, 275, 278, 283, 

 285, 286, 288; fig. 5, p. 13 (forked pinnule) ; figs. 15-17, p. 48; figs. 21-24, p. 50; figs. 41-44, p. 58; 

 fig. 87, p. 81; fig. 113, p. 93; figs. 184-186, p. 98; fig. 341, p. 281; fig. 355, p. 292. KOEHLER, 

 Les e'chinodermes des mers d'Europe, vol. 2, 1927, p. 129 (description; range), pi. 11, figs. 2, 

 10, pi. 17, fig. 15. MORTEN-SEN and LIEBERKIND, Die Tierwelt der Nord-und Ostsee, vol. 12, 

 1928, p. viii. 86 (relation to copepods). EKMAN, Tiergeogniphie des Meeres, 1935, p. 251. 



Heliometra esehrichti GISLEN, Zool. Bidrag Uppsala, vol. 9, 1924, p. 53. 



Antedon (Heliomelra) eschrichti GISLEN, Zool. Bidrag Uppsala, vol. 9, 1924, p. 287. 



Antedon eischrichti MESSJATZEW, Internat. Rev. gesamt. Hydrobiol. und Hydrogr., vol. 12, 1925, 

 p. 397 (Persey station, White Sea). 



Heliomelra glacialis typica GORBUNOW, Trans. Arctic Inst., Leningrad (in Russian), vol. 2, 1932, 

 p. 118; vol. 7, 1933, p. 42 (Russian Harbor, stations I, 1; Neupokojew Bay, station 14), p. 50 

 (same), p. 55 (Zarnitza station 14), p. 67 (station 1); vol. 8, 1933, pp. 10, 11, 35 (stations 25, 

 46, 50, 58, 59, 62, 67, 69, 77, 79, 82; Jermak and Malygin), p. 55. 



Heliomelra glacialis f. typica GORBUNOW, Trans. Arctic Inst., Leningrad (in Russian), vol. 2, 1932, 

 p. 131. 



Heliometra glacialis var. quadrata GORBUNOW, Trans. Arctic Inst., Leningrad (in Russian), vol. 2, 

 1932, pp. 95, 99, 100 (stations 43, 44, 45, 19, 17, 22), pp. 101, 135 (station 17). DJAKONOV, Les 

 e'chinodermes des mers arctiques, Leningrad (in Russian), 1933, p. 22 (in key), p. 24 (characters; 

 range); fig. 10B, p. 24. 



Heliometra glacialis f. quadrata GORBUNOW, Trans. Arctic Inst., Leningrad (in Russian), vol. 7, 1933, 

 p. 42 (station), p. 50; vol. 8, 1933, pp. 10, 11, 36 (Jermak stations), p. 55. 



Heliomelra, sp. (juv.) GORBUNOW, Trans. Arctic Inst., Leningrad (in Russian), vol. 8, 1933, p. 39 

 (distribution). 



7 Antedon sp. THORSON, Medd. Gr0nland, vol. 100, No. 2, 1933, pp. 26, 30, 38, 40, 58, 59 (East Green- 

 land stations). 



Anledon eschrichtei KOLOSVARY, Folia zool. hydrobiol. Riga, vol. 9, 1936, p. 83 (in Hungarian National 

 Museum) . 



Diagnostic features. The range of H, glacialis does not, so far as we know, overlap 

 the range of any other species of this subfamily. In the northwest Pacific region, 

 however, it may possibly be found to approach, or even to overlap, the range of some 

 species of Florometra, from which it may be at once distinguished by the absence of 

 spines on the distal edges of the brachials and on the borders of the ossicles of the 

 division series and arm bases, by the absence of a rudimentary terminal comb on the 

 outer portion of the proximal pinnules, and by the position of the syzygies of which 

 the third is between the fourteenth and fifteenth brachials and the distal occur at 

 intervals of typically 4 muscular articulations. 



This species has frequently been confused with Poliometra prolixa, which has a 

 similar geographical range, and with the species of Hathrometra, which in the Atlantic 

 overlap the southern border of its habitat. 



Heliometra glacialis is bright yellow in color, sometimes tinged with purple, while 

 the species of Poliometra and of Hathrometra are grayish green to doll grayish white. 



The centrodorsal in Poliometra and in Hathrometra is conical, about as high as 

 broad, while in Heliometra it is flattened hemispherical and always broader than 

 high; and in both these genera PI is greatly elongated, from 2 to 3 times as long as 

 P a , and composed of segments, all of which except the basal are greatly elongated 

 with spinous distal ends. 



