CAMPTOPLITES 449 



Bifurcations of Harmer's type 4 are sometimes found in the main branches which may 

 thus have as many as four series of zooecia immediately before the bifurcation. The 

 large round-headed avicularia resemble those of C. giganteus in their long stout beak, 

 but differ in the thicker spike on the tip of the mandible (cf. Fig. 43 B and I), the relatively 

 straight sclerites (cf. Fig. 43 E and L), and the flatter back of the head of the avicularium 

 as seen in profile (cf. Fig. 43 B and H). The large long-headed avicularia have a more 

 obtuse upper head-angle than those of C. giganteus (cf. Fig. 43 D and J). Lateral oval 

 areas as described on p. 339 are to be seen on some zooecia. 



The specimen from St. WS 871 (off the Patagonian Shelf) is rather different from 

 the type (cf. Plate XII, figs. 1 and 2). Cross-connexions by rootlets are more 

 common, the branching is more profuse and the zooecia shorter, so that the colony is 

 reticulate and resembles the colonies of the reticidatus group, rather than those of 

 typical var. quadriavicularis. There are no large round-headed avicularia and the small 

 round-headed avicularia are smaller. The large long-headed avicularia are much shorter 

 and have a thickening where the beak joins the head. In the type a faint trace of such 

 thickening is occasionally visible, but the majority of these avicularia show none at all. 

 A spine is present on the inner distal corner of some zooecia of the Patagonian specimen, 

 whereas the corners in the type may be spike-shaped but are not drawn out into true 

 spines. Despite these differences it is unlikely that the specimen from St. WS 871 re- 

 presents a distinct variety. Fragmentary material from Challenger St. 320 (which is also 

 off the Patagonian Shelf) is intermediate in character. The branches have the straggling 

 appearance of those of the typical colony, there are few cross-connexions, and both 

 large and small round-headed avicularia are present. On the other hand, the large long- 

 headed avicularia, which are of intermediate size, have a thickening where the beak 

 joins the head, and spines are present on some zooecia. 



In the type-specimen, which was taken on 7 February 1927, ovicells are very 

 numerous on both main and secondary branches. Some of these fertile zooecia have 

 the ovicell empty and a large egg in a follicle in the body cavity. A very delicate ovisac 

 can sometimes be detected, the shallow ovicell forming a cap to it. In other zooecia the 

 egg is in various stages of segmentation and occupies the ovisac. In many of the fertile 

 zooecia the polypide is wholly or partially degenerate, but some in which the embryo is 

 at an advanced stage have a complete and normal polypide (Fig. 44 B). 



6. Camptoplites lewaldi (Kluge). Plate XI, figs. 5, 6; Fig. 45 C, D, G. 



Biigala lewaldi Kluge, 1914, p. 630, pi. xxx, fig. 3, text-fig. 15. 



Camptoplites lewaldi Harmer, 1923, p. 300. 



Station distribution. Antarctic: Victoria Quadrant, Sts. 1652, 1660. 



Geographical distribution. Wilhelm II Land (Kluge) ; Ross Sea (National Antarctic Expedi- 

 tion; Discovery). 



Secondary branches are present in these specimens, but apparently develop rather 

 late. The Discovery material from St. 1652 comprises some pieces with well-developed 

 fan-shaped secondary branches placed at regular intervals throughout their length 



