Discovery reports (1940) Discovery reports discoveryreports18inst Year: 1940 HELIOMETRINAE iSi distal edges of the lower brachials are not everted into strong spiny ridges at right angles to the dorsal surface as in F. mawsoni. The cirri, although they do not comprise more or many more segments than those of F. mawsoni, are much heavier and longer. Genus Anthometra Clark Anthometra adriani (Bell) (Plate III, fig. 4) Antedon adriani Bell, iqocS, p. 4, pi. ii; 1917, p. 2. Promaclwcrimis {Atithoiiietra) adriani Clark, 1913, p. 60; 1915 a, pp. 135-7, pls- vi-vii. Anthometra adriani Mortensen, 19
Discovery reports (1940) Discovery reports discoveryreports18inst Year: 1940 HELIOMETRINAE iSi distal edges of the lower brachials are not everted into strong spiny ridges at right angles to the dorsal surface as in F. mawsoni. The cirri, although they do not comprise more or many more segments than those of F. mawsoni, are much heavier and longer. Genus Anthometra Clark Anthometra adriani (Bell) (Plate III, fig. 4) Antedon adriani Bell, iqocS, p. 4, pi. ii; 1917, p. 2. Promaclwcrimis {Atithoiiietra) adriani Clark, 1913, p. 60; 1915 a, pp. 135-7, pls- vi-vii. Anthometra adriani Mortensen, 1918, p. 18; Clark, 1921, many references including description of side plates (p. 270) and of pentacrinoid young (pp. 557-9, fig. 938); Mortensen, 1925 b, p. 2; Gislen, 1928, p. 11; Clark, 1929, p. 662; Grieg, 19290, p. 4; John, 1937, p. 10; Clark, 1937, pp. 14-16. St. 190. 24. iii. 27. Bismarck Strait, Palmer Archipelago. 64° 56' S, 65° 35' W. 130-100 m. Gear DLH, NRL. Bottom: stones, mud and rock. Two specimens. St. 1660. Ross Sea. 74° 46-4'S, 178' 23-4'E. 351m. Gear OTL. Bottom: mud. One broken specimen. St. 1952. II. i. 37. Between Penguin Island and Lion's Rump, South Shetlands. 367-383 m. Gear DRR. Bottom: soft mud. Nine specimens. Fig. 5. Anthometra adriani. a, a male genital pinnule from the side, b, a female genital pinnule from the side, c, the same obliquely from above. All x 7. It appears from my own counts and those of others that the cirri of large specimens may be numerically described as follows: L-LXX, 60-86, up to 90 mm. long. Gislen says that some of the segments of the proximal pinnules are expanded and that it thus 'forms a transition to the Isometrinae'. It is the segments of the genital pinnules along which the gonad lies that are expanded, and they are a little more ex- panded in the female than the male. Figures are given (Fig. 5): the female pinnule is from a well preserved Terra Nova specimen with nearly complete arms which are
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