Discovery reports (1962) Discovery reports discoveryreports30inst Year: 1962 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)
Discovery reports (1962) Discovery reports discoveryreports30inst Year: 1962 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 Creek.
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