NOTOPLITES 



343 



N. vanhoffeni, though they are probably equivalent in their morphology, project more 

 from the branch both frontally and laterally, being larger and more rounded (Fig. 10A). 

 This gives a distinctly different appearance to the fertile branches of the two species, 

 but the non-fertile branches also differ so distinctly that a mixture of the species can be 



Fig. 9. A. Notoplites drygahkii (Kluge). St. WS 27, South Georgia. To show internal spines (attached to 

 oblique distal wall) and differences in orifice from N. vanhoffeni (cf. Fig. 10 B). In some specimens the 

 distal wall is farther from orifice. B. N. drygahkii (Kluge). St. TN 331, Ross Sea. Ovicell and adjacent 

 structures. The operculum is open. C. N. ? drygahkii (Kluge). St. TN 194, off Oates Land. One 

 zooecium showing abnormal scutum. Slightly oblique view. Operculum open. D. N. antarcticus 

 (Waters). St. 1948, near Elephant Island. One zooecium. 



i.s. internal spine, sc. scutum. 



6-2 



