326 



POLYNESIA 



indicate the same affinity. Otoccmcha is pecnliar. The fresh- 

 water Mollusca, liesides the Isidora cliaracteristic of the sub- 

 region, are partly related to New Caledonia through the occur- 

 rence of llelmiopsis, partly to Tasmania through Fotamop^jrgvs, 

 while the peculiar Latia is possibly akin to Gvndlachia (Tas- 

 mania). The land operculates number only 5 genera and 14 

 species in all, excluding a doubtful Dij^lommatina} 



Land and Frcsli -water Mollusca of the JVeozcalanian Province 



Lord Hoives I. is remarkalile as containing a Placostylus, 

 which thus links the island with this province. Tlie remainder 

 of the fauna is Polynesian, with the exception of a species 

 (common to the Fijis) of Farmella, a slug akin to Helicarion, 

 Pccrmacochlea, and Cysfopelta. 



(3) The Polynesian Sub-region includes all the island groups 

 of the central and southern Pacific (except those classified in the 

 Papuan and Australian sub-regions), from 

 the Pelews and Carolines in the west to 

 the Marquesas and l*aumotus in the east, 

 and from the Tonga group in the south 

 to the Sandwich Is. in the north. It may 

 Ije subdivided into («) tlie Polynesian pro- 

 vince proper, and (/:>) the Hawaiian pro- 



A 



Fig. 216. — Characteristic vince, which includes the Sandwich Is. 



Polyuesian Mollusca : A, fiiil-i- 

 Achatinella vulpina Fi'r., "^ ' 



Sandwich Is. ; B, Par- (ft) The general features of the Poly- 

 Socief^'i"^^*'""' ^''^^^' nesian province are very similar through- 

 out, although the Mollusca of each island 

 group are in the main peculiar. The species are iiiostly small 



^ Hedley and Suter, Proc. Linn. Soc. K. S. Wales (2), vii. \). 613. Twenty-one 

 species are "introduced." 



