. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. DESCRIPTION OF SPECIES 89 The third criterion, the presence or absence of intermediate papillae in the branchial sac, is also an unreliable character. In A. translucida, Hartmeyer (1912) found that secondary papillae were present in older specimens but not in younger ones. Arnback (1938) also noted that in A. translucida these papillae exist in some parts of the branchial sac but not in others. For these reasons I regard A. plicata as very probably a synonym of A. translucida. Distribution. Anta
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. DESCRIPTION OF SPECIES 89 The third criterion, the presence or absence of intermediate papillae in the branchial sac, is also an unreliable character. In A. translucida, Hartmeyer (1912) found that secondary papillae were present in older specimens but not in younger ones. Arnback (1938) also noted that in A. translucida these papillae exist in some parts of the branchial sac but not in others. For these reasons I regard A. plicata as very probably a synonym of A. translucida. Distribution. Antarctic (South Georgia), Subantarctic (Kerguelen). Ascidia challenged Herdman (Text-fig. 27) Ascidia challengeri Herdman, 1882, p. 102, pi. 30. Ascidia charcoti Sluiter, 1905, p. 471. Ascidia dispar Arnback, 1938, p. 48; text-fig. 11. Occurrence. St. 145: S. Georgia, 26-35 m. St. 156: S. Georgia, 200-236 m. St. 160: Shag Rocks (S. Georgia), 177 m. St. 164: S. Orkneys, 24-36 m. St. 195: S. Shetlands, 391 m. St. 1652: Ross Sea, 567 m. St. 1660: Ross Sea, 351 m. St. WS 27: S. Georgia, 107 m. St. MS 71: S. Georgia, 110-60 m. , 1934-7, Stella Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Institute of Oceanographic Sciences (Great Britain); National Institute of Oceanography of Great Britain; Great Britain. Colonial Office. Discovery Committee. London ; New York : Cambridge University Press
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