CAMPTOPLITES 4S i 



of the total length. The specimen had avicularia of all the usual three kinds as well as 

 this large one. 



7. Camptoplites giganteus (Kluge). Plate XI, fig. 4; Figs. 43 H-L, 45 E, F. 



Bugula gigantea Kluge, 1914, p. 630, pi. xxx, fig. 4, text-fig. 16. 



Camptoplites giganteus Harmer, 1923, p. 300. 



Station distribution. Antarctic: Weddell Quadrant, St. WS 33. 



Geographical distribution. South Georgia (Discovery; Shackleton-Rowett Expedition); 

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



These specimens agree in most respects with Kluge 's description. The two kinds of 

 long-headed avicularia are similar (Fig. 43 J, K), the round-headed avicularia (Fig. 

 43 H) have the long down-turned beak (" ziemlich langem, senkrecht zur Obermandibel 

 an ihrem freien Ende stehenden, spitzen Auswuchs"), the zooecia of the main branches 

 are as shown in Kluge's figure and the ovicells agree with his description. 



The specimens from South Georgia differ from Kluge's in the possession of secondary 

 branches (Plate XI, fig. 4). These when fully formed are much branched, spreading out 

 fanwise. The material from Ross Sea consists of small fragments only and does not show 

 secondary branches. In all my material the axillary chamber forms runners. 



The round-headed avicularia from both localities vary a little in size, but form a 

 graded series rather than two groups as in Camptoplites bicornis var. quadriavicularis. 

 They are all larger than those of C. lewaldi (cf. Plate XI, figs. 4, 5 and 6). Kluge does 

 not mention this and it seems possible that his specimens had smaller avicularia. 



This species is closely allied to C. bicornis. Its ovicells (Fig. 45 E, F) are rather less 

 reduced, being intermediate between those of C. lewaldi and C. tricornis. 



8. Camptoplites tricornis (Waters). Plate XIII, fig. 3 ; Fig. 46 B, C. 



Bugula tricornis Waters, 1904, p. 23, pi. i, fig. 9 a-d, pi. viii, fig. 3; Livingstone, 1928, p. 27 

 (references). 



Camptoplites tricornis Harmer, 1923, p. 300. 



Station distribution. Antarctic: Weddell Quadrant, Sts. 27, 42, 156, 160, WS 27, WS 33, 

 WS 42, MS 68; Victoria Quadrant, Sts. 1651, 1652, 1660. 



Geographical distribution. South Georgia; Shag Rocks (Discovery); Bellingshausen Sea 

 (Waters); Adelie Land (Livingstone); Wilhelm II Land (Kluge); Oates Land (Terra Nova); Ross 

 Sea (National Antarctic Expedition; Terra Nova; Discovery; 30.3.5.1-4). 



After examination of the Belgica collection Kluge (1914, p. 625) described this 

 strongly characterized species under the name introduced by Waters. Waters 's figures 

 are not characteristic, and in particular do not show the median spine, but two 

 peculiarities of the species are recognizable, namely, the lateraj proximal points on the 

 large avicularia, and the unusual position of the lateral rootlet-chamber (Fig. 46 C). 

 These chambers, from which the lateral rootlets and the secondary branches both 

 originate, are not in the angle between two successive marginal zooecia, as in other 

 species, but are on the side of one zooecium where it bends upwards, as figured by 

 Waters and described by Kluge. Both the axillary and the lateral chambers (Fig. 



