. Fig. ii. A. Notoplites drygalskii (Kluge). National Antarctic Expedition. McMurdo Sound, ancestrula. B. N. antarcticus (Waters). St. WS 42, South Georgia. Showing ancestrula. r. rootlet. Showing Certain specimens in the Terra Nova collection differ from typical N. drygalskii in their scuta. Both distal and proximal lobes are shorter and narrower, and the lumen is narrow and more or less bifid, and has no "islands" (Fig. 9 C). In typical specimens the scuta cover the opesia, except for the area occupied by the operculum, and their

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