426 DISCOVERY REPORTS 



in the inner series. The fertile zooecia have probably been overlooked hitherto 

 because reproduction is at an early stage and in most instances the only evidence that 

 a zooecium is fertile is the very inconspicuous ovicell and the presence of a small ovary 

 similar to that described in Himantozoum tanrinum by Harmer (1926, p. 455). 



In describing H. sinuosum var. variabilis Kluge explained that he had insufficient 

 material for comparison, and he made it clear that his treatment, as one variable variety, 

 of the two forms recognizable in his material was tentative. 



He gave three figures to illustrate the two extreme forms and an intermediate 

 specimen. The first (text-fig. 19 a) only differs from Busk's figure of the typical form 

 in the rounded ends of the zooecia of the inner rows, and it is clear from what I have 

 said above that it is not to be distinguished from the typical form, the round-ended 

 zooecia corresponding very closely with the non-fertile zooecia of the type. 



The intermediate specimen (Kluge, 1914, pi. xxviii, fig. 6) has zooecia, with strongly 

 arched ends and rather more sharply pointed corners, which might well be fertile. It 

 much resembles the specimen figured by Hasenbank (1932, text-fig. 7) and they both 

 have avicularia on zooecia of the inner as well as the outer series. It seems possible 

 that these should likewise not be distinguished from the type. On the other hand, 

 Braem's observations, discussed above, suggest that Hasenbank's specimens may have 

 differed from the typical form in their alimentary canal. 



Kluge described reduced ovicells in his variety which appear to have been similar to 

 those now described in the typical form, but he did not say whether he had observed them 

 in both forms of the variety. Hasenbank did not find ovicells in his specimens, although 

 he observed fertile zooecia. As the ovicell is very inconspicuous and Hasenbank's figured 

 fertile zooecia are similar in shape to those of the type, I am, however, not convinced 

 that ovicells were not present. 



If Kluge 's intermediate specimen proved to belong to the typical form, the extreme 

 form shown in his text-fig. 19 b, which is rather markedly different from the other 

 figured specimens, would remain alone in var. variabilis. 



4. Himantozoum sinuosum var. variabilis (Kluge). 



Bugula sinnosa var. variabilis (part) Kluge, 1914, p. 632, text-fig. 19 b. 



Himantozoum sinuosum var. variabilis Harmer, 1923, p. 312. 

 Station distribution. Not represented in the Discovery collections. 

 Geographical distribution. Southern Ocean, 3397 m. (Kluge). 



I have seen no specimen of this variety, which is discussed under Himantozoum 

 sinuosum. 



Bugula Oken, 18 15 

 1. Bugula calathus Norman. 



Bugula calathus Norman, 1868, p. 218, pi. vi, figs. 3-8; Kluge, 1914, p. 636, text-fig. 22 (refer- 

 ences); Barroso, 1922, p. 94; Neviani, 1939, p. 18. 

 Bugula flabellata Hasenbank, 1932, p. 330, text-fig. 5 A; O'Donoghue and de Watteville, 



J935. P- 2 ° 8 - 

 ? not Bugula calathus Kluge, 1908, p. 518. 



