NOTOPLITES 



351 



figured specimen (Fig. 15 C) the first two zooecia have formed lateral buds. In the same 

 material a zooecium in the more distal parts of the colony sometimes forms a single 

 distal bud, so that, for the length of one or two zooecia, the colony is uniserial. Here 

 too the uniserial zooecia are jointed proximally. 



8. Notoplites tenuis var. uniserialis var.n. Fig. 14 A-C. 

 Station distribution. Not represented in the Discovery collections. 



Geographical distribution. Oates Land (Terra Nova) ; Ross Sea (National Antarctic Expedi- 

 tion). 



Holotype. St. TN 194. 



r.c. 



>-A 







■5mm 



Fig. 14. A-C. Notoplites tenuis var. uniserialis var.n. St. TN 194, off Oates Land. A. Slightly oblique view 



of bifurcation. B. Zooecium in oblique frontal view. C. Zooecium in side view. Opesia stippled. 



c. cryptocyst, o.a. "oval areas", o.mu. occlusor muscle, p.mu. parietal muscle, r.c. rootlet-chamber. 



This variety is represented by fifteen fragments, with two to twelve zooecia each. 

 The zooecia are indistinguishable from those of Notoplites tenuis except that they are a 

 little more slender (Fig. 14 B, C). Scuta and avicularia are absent (as they are on 

 many zooecia of N. tenuis). As in N. tenuis the cryptocyst may be smooth or granular. 

 The fragments are constantly uniserial and they bifurcate by the formation of a pair of 

 distal buds (Fig. 14 A). Zooecia formed from lateral buds projecting at right angles to 

 the zooecia are common. As uniserial zooecia and lateral buds have also been seen in 

 N. tenuis (see p. 350) there seems to be no reason to give this form more than varietal 

 rank. Each zooecium is jointed proximally, as in the uniserial zooecia of typical 



N. tenuis. Ovi cells are unknown. 



7-2 



