NOTOPLITES 



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tensive and more or less branched (Fig. 10 B), as in Kluge's figure, and "islands" are 

 only very exceptionally present (Fig. 10 A). 



The zooecia of N. drygalskii may be longer than shown by Kluge, with a corre- 

 sponding elongation of the opesia. In such specimens the distal spine is commonly 

 absent, and when present is small. In all these characters there is considerable variation 

 within the colony. 



I i I ■ 1 I I 



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 



