500 EIGHTH PACIFIC SCIENCE CONGRESS 



jected to a new analysis. In any case in any scheme for subdivision of 

 the Indo-Pacific these marginal areas must receive due consideration. 

 Oliver (1915) presented an account of the mollusca of the Kerma- 

 decs. Since then changes in nomenclature have altered some of the 

 relationships and a more detailed analysis has been found desirable. 

 Oliver tabulated the relationship of the Kermadec mollusca under the 

 following heads: Endemic, Polynesian, New Zealand, and Pelagic. The 

 results so obtained give a biassed picture of relationships. No account 

 was taken of Australian relationships, nor was any distinction made 

 between those species occurring in Australia, New Zealand, and the 

 Kermadecs, and those found in New Zealand and the Kermadecs only. 

 These latter species alone form the neozelanic element in the Kermadec 

 fauna, or the Kermadecian element in the New Zealand fauna depend- 

 ing on the direction of original migrations. Lord Howe and Norfolk 

 have been grouped into a Phillipian province and included in the 

 Neozelanic region by Whitley. It is therefore necessary to consider the 

 fauna of the Kermadecs in relationship to that of the Phillipian pro- 

 vince. For the above reasons the marine mollusca of the Kermadecs 

 have been analysed under the following heads: Endemic, Occurring in 

 New Zealand, Occurring in New Zealand but not in Australia, Occur- 

 ring in Australia, Occurring in Australia but not in New Zealand, 

 Occurring in Norfolk and/or Lord Howe Islands, South Pacific and 

 Pelagic (or drift shells). 



Total Per Gastro- Pelecy- Amphi- Cephalo- 

 cent poda poda poda poda 



The endemic element (one third) is thus seen to be the strongest 

 represented. The essentially New Zealand element is very small (8 

 species), indicating that although 22 species are common to the Ker- 

 madecs and New Zealand, 16 of them are also found in Australia. It 

 is most probable that these species have been derived from Australia 

 rather than from New Zealand. 



The eight species found in the Kermadecs and New Zealand, but 

 not in Australia are: Xenophalium royanum (Iredale), Poirieria ze- 

 landicus (Q. 8: G.), Neothais smithi (Brozier), Monia zelandica (Gray), 



