466 DISCOVERY REPORTS 



Station distribution. Antarctic: Weddell Quadrant, St. 175. 



Geographical distribution. South Shetland Islands (Discovery) ; Palmer Archipelago ? (Calvet) ; 

 Bellingshausen Sea? (Waters); Wilhelm II Land (Kluge); Oates Land (Terra Nova). 



These small specimens from the Antarctic agree very well with Kluge's account of 

 Camptoplites areolatus. There is usually a flexible zone or incipient joint at the base of 

 the branch, passing proximally to the opesia of the inner zooecium. The ovicells are 

 radially striated at first, but in one or two, on Discovery fragments, a faint trace of 

 superimposed reticulation can be seen (Fig. 54 B), and this calcification had evidently 

 proceeded further in Kluge's material. If Kluge is right in attributing C. reticulatas 

 (Calvet, 1909, pi. i, fig. 3, not Busk) to this species the reticulation must eventually 

 become thick and heavy as in C. retiformis, a species which Calvet 's figure might well 

 represent (see p. 455). 



C. retiformis and C. areolatus also resemble each other in their avicularia which are 

 similar in general shape (cf. Figs. 47 A-G and 55 A, B). C. areolatus differs from 

 C. retiformis in its biserial, jointed colony, in the presence of a second outer distal spine 

 on many zooecia and in the possession of a cryptocyst. 



The Antarctic form identified by Waters with C. reticulatus probably belonged to this 

 species, as suggested by Kluge, but Busk's South Atlantic specimens appear to be 

 distinct from both (see C. asymmetricus, below). 



C. areolatus and C. asymmetricus clearly belong to Camptoplites, for they have the 

 characteristic stalked avicularia, and axillary rootlets arising from chambers with 

 runners. The zooecia are rather more calcified than those of other species of Campto- 

 plites and their shape is reminiscent of the Scrupocellariidae, especially of some species of 

 Notoplites. This resemblance is increased by the tendency to form joints (Fig. 54 C), and 

 by the presence of a line of lateral oval areas (Fig. 54 B, D) which are, however, also to 

 be seen in C. bicornis var. quadriavicularis (see p. 449). 



Var. variospinosa (Kluge) was described from two small colonies and a fragment. 

 One of the colonies had an ancestrula. They differed from the typical form in the greater 

 number of spines, in the shape of the zooecia which were considerably wider distally, and 

 in possessing only one kind of avicularium, but these are juvenile features, and it seems 

 probable that var. variospinosa is no more than the young colony of typical C. areolatus. 

 Bugula reticulata var. spinosa Waters (1904, p. 22), given by Kluge as a doubtful synonym 

 of var. variospinosa, appears to be the young colony of some other species (see p. 441). 



21. Camptoplites asymmetricus sp.n. Figs. 53 D, 54 C, D, 55 C-F. 

 Bugula reticulata Busk (part), 1884, p. 40 (not figured). 



Station distribution. Sub- Antarctic: South Atlantic Ocean, St. WS 840. Antarctic: Weddell 

 Quadrant, St. 156. 



Geographical distribution. Off Patagonian Shelf below 400 m. (Busk; Discovery); Chile 

 (Busk); South Georgia (Discovery). 



Holotype. Challenger, St. 320, 1098 m., 87. 12.9. 188. 



Paratypes. Challenger, St. 320, 1098 m., 87. 12.9. 184, 99.7.1.283, 34. 11. 12. 11, Challenger, 

 St. 308 1 , 320m., 87. 12.9. 186. 



1 This is wrongly given in the Challenger Report as St. 303 (see Murray, 1895, p. 1138). 



