. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. DESCRIPTION OF SPECIES 87 The systematic position of the genus has been much discussed. Originally placed in the family Polyclinidae by Herdman (1886), it is now generally regarded as a phlebobranchiate ascidian, related to, or actually within, the family Diazonidae. The larva, with its triangular arrangement of the papillae, also shows that the genus should be removed from the Polyclinidae. The ' Discovery' records are of special interest as they extend the known range northwards to the edge of
. Discovery reports. Discovery (Ship); Scientific expeditions; Ocean; Antarctica; Falkland Islands. DESCRIPTION OF SPECIES 87 The systematic position of the genus has been much discussed. Originally placed in the family Polyclinidae by Herdman (1886), it is now generally regarded as a phlebobranchiate ascidian, related to, or actually within, the family Diazonidae. The larva, with its triangular arrangement of the papillae, also shows that the genus should be removed from the Polyclinidae. The ' Discovery' records are of special interest as they extend the known range northwards to the edge of the Antarctic and beyond into the Subantarctic (Patagonian Shelf). Arnback (1950) had already recorded the species (as T. antarcticum) from South Georgia, at that time the most northern locality. Distribution. Antarctic (Cape Adare, MacRobertson Land, Kaiser Wilhelm II Land, Graham Land, South Georgia, South Shetland Islands, South Sandwich Islands), Subantarctic (Patagonian Shelf). Family ASCIDIIDAE Adams, 1858 Genus Ascidia Linnaeus, 1767 Ascidia translucida Herdman (Text-fig. 26) Ascidia translucida Herdman, 1880, p. 466. ?Ascidia plicata Kott, 1954, p. 150, fig. 31. Occurrence. St. 39: S. Georgia, 179-235 m. St. WS25: S. Georgia, 18-27 m. St. MS 10: S. Georgia, 26-18 m. St. MS 65: S. Georgia, 39 m. St. MS 68: S. Georgia, 220-247 m- External appearance (Text-fig. 26A). The largest of the six specimens is 19-0 cm. long and the. Text-fig. 26. Ascidia translucida Herdman (St. MS 68): A, external appearance; B, specimen with test removed; C, D, E, dorsal tubercles of small, medium and large specimens, 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
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