458 DISCOVERY REPORTS 



13. Camptoplites latus (Kluge). Figs. 48 F, 49 A. 

 Bugula lata Kluge, 1914, p. 634, text-fig. 20. 

 Camptoplites latus, 1923, p. 300. 



Station distribution. Antarctic: Victoria Quadrant, St. 1652. 



Geographical distribution. Wilhelm II Land (Kluge); Ross Sea (Terra Nova; Discovery). 



These specimens agree very closely with Kluge 's account of Camptoplites latus. The 

 radial sculpture, shown by him, is present in young ovicells, but later a punctate sculp- 

 ture, consisting of small, widely spaced dots, is superimposed (Fig. 49 A). 



C. latus is distinguished from C. retiformis by the shape of the zooecia, by the sculp- 

 ture of the fully calcified ovicells, by the direction of the spines, by the exceedingly short 

 stalks of the large avicularia, and by the acute lower head-angle of the small ones 

 (cf. Figs. 47 D, F and 48 F). The small avicularia are less variable in size, the very small 

 ones found in C. retiformis being absent in C. latus. Kluge 's figures (fig. 20 and pi. xxviii, 

 fig. 5) show most of the points of contrast very clearly. 



14. Camptoplites latus var. striata var.n. Fig. 49 B-D, F. 

 Station distribution. Antarctic: Weddell Quadrant, Sts. 190, 599. 

 Geographical distribution. Palmer Archipelago; Adelaide Island (Discovery). 

 Holotype. St. 190, Palmer Archipelago. 



This variety differs from Camptoplites latus in its ovicells and large avicularia. The 

 ovicells are broader and show more marked radial striation, appearing almost fluted, and 

 there is much less change with age (Fig. 49 B, C). In a colony with three fertile zones 

 the fluting is the conspicuous sculpture of all the ovicells. A very faint reticulation can 

 be discerned on a few ovicells of the two older zones, and also occasional dots, like those 

 of typical C. latus, but this secondary sculpture is extremely inconspicuous. Although 

 most of the ovicells in the second zone contain eggs or embryos, calcification of the 

 ectooecium is only completed in the third zone. 



The large avicularia (Fig. 49 F), which are short-stalked as in typical C. latus, are 

 longer headed and are commonly found on the marginal zooecia (Fig. 49 D), whereas 

 those of C. latus are only found on zooecia of the inner rows. In the shape of the zooecia 

 and small avicularia, and in the position of the spines, var. striata resembles C. latus. 



15. Camptoplites latus var. aspera var.n. Plate IX, fig. 4 ; Figs. 47 I, J, 49 E, 50 A-C. 

 Station distribution. Antarctic: Weddell Quadrant, Sts. 45, 140, 149, WS 42. 

 Geographical distribution. South Georgia (Discovery). 



Holotype. St. WS 42. 



This variety differs from Camptoplites latus in its ovicells and large avicularia, and in 

 its spines, some of which are directed obliquely forwards while others point distally as 

 in C. latus. When first formed the ovicells show distinct radial striation, but reticulation 

 soon appears and gradually becomes very distinct, though not heavy as in C. retiformis 

 (Fig. 50 B, C). Subsequently this reticulation is almost completely obliterated by a 

 general thickening and roughening of the calcification (Fig. 50 A). The reticulation may 



