n4G DR. S. J. HTOKSOX OX 



view, and when I suggested it to him he expressed to me per- 

 sonally his disagreement with it. The term " trophodisc " was 

 suggested by myself and was never used by Moseley at all. 



As regards the view itself. It was expressed as a result of a 

 long investigation of the development of the gonophores of a 

 Stylaster (Allopora) from the coast of Norway, and every fact 

 described was confirmed by the examination of many comparable 

 preparations. Knowing now, after twenty-five years' experience 

 of this group, better than I did then, the difficulty of the 

 investigation, I realise the probability that some stages in the 

 development may have been missed. Moreover, the study of 

 Kuhn's excellent memoir on the development of the gonophores 

 of Hydrozoa has to some extent shaken my faith in my own 

 view ; but the homology of the gonophores of Stylasteridse with 

 the adelocodonic gonophores of other Hydrozoa has not yet been 

 proved, and will not be established by scattered observations on a 

 few stages of the development of the male gonophore alone. The 

 principal difficulty in accepting the older view held by Moseley 

 arose from my observations on the development of the female 

 gonophore, and until this investigation has been repeated with 

 more modern methods of study than I had at my disposal in 1890, 

 the true homologies of these organs must remain undetermined. 

 In the meantime the discovery that MillepoiYi, notwithstanding 

 its calcareous skeletal structures, does give rise to free-swimming 

 medusae, has removed one of the principal initial difficulties I felt 

 in believing that the gonophores of Stylasteridas could represent 

 reduced medusa?, and I am quite prepared, when the time comes, 

 to a.bandon my own view in favour of the more conventional and 

 older one of Moseley. 



Order ALCYONAEIA. 



Family CLAVULARiiDiE. 



Clavulauia moresbii, sp. n. (PL I. fig. 4; Text-fig. 1.) 



W.S.W. ofi- Moresby Island, 100 fathoms. 



The widely distributed and very variable genus Clavidaria is 

 badly in need of revision. It is probable that such a revision 

 would lead to a considerable reduction in the number of the 

 species, many of which have been founded on very inadequate 

 characters. Nevertheless, the specimens from Moresby Island 

 show very distinct specific characters and must be regarded as 

 the type of a new species. 



The genus is well represented both in the Norwegian waters 

 and in the North Pacific Ocean. The occurrence of a species in 

 British Columbian waters might have been anticipated, and in 

 itself is not a fact of any zoo-geographical impoi'tance. 



The specimens were obtained by Prof. Willey in 1914, who 

 writes that these whitish " rose-headed" Clavularias were growing 



