_The Fiji Is._, by the possession of 14 _Placostylus_ of the _Charis_ section, which is entirely absent from the adjacent Tonga group, form the eastern limit of the province. There appears to be only a single _Partula_, but the Polynesian element, especially as seen in _Navicella_ (8 sp.), _Neritina_ (20 sp.), _Helicina_ (11 sp.), and _Omphalotropis_ (11 sp.), is very strong. The _Microcystis_ (9 sp.) and _Trochomorpha_ (14 sp.) are also of a Polynesian type. (2) The =Australian Sub-region= includes the whole of Australia (with the exception of the Queensland province) and Tasmania, with New Zealand and the off-lying islands. The fauna, from the prevalence of desert, is scanty, especially in genera. Land operculates are almost entirely wanting. _Limax_ is not indigenous, though several species have become naturalised. The bulk of the fresh-water species belong to _Isidora_, and it is doubtful whether _Physa_ occurs at all. _Unio_ has a few species, and also _Vivipara_, but neither _Anodonta_ nor _Ampullaria_ occur. There are a few _Melania_ and _Neritina_. _Tropical South Australia._--The Mollusca are scanty, and occur chiefly in the neighbourhood of the rivers, the soil being arid, with no shelter either of trees or rocks. Fresh-water species predominate, and the rich land fauna of Queensland is totally wanting. There are no land operculates, 6 _Hadra_, 1 _Bulimus_ (?), 1 _Stenogyra_. _West Australia._--Owing to the deserts which bound it, the Mollusca are very isolated, only one species being common with N., S., and E. Australia. The chief characteristics are _Liparus_, a form intermediate between _Helix_ and _Bulimus_, and, among the _Helices_, the group _Rhagada_. There are no slugs, no carnivorous snails, and only three land operculates. _Land Mollusca of West Australia_ Lamprocystis 1 Hyalinia 1 Patula 7 Chloritis 2 Gonostoma 2 Trachia 3 Xerophila 1 Rhagada 8 Hadra 5 Liparus 10 Pupa 4 Succinea 3 Cyclophorus 2 Helicina 1 In _Eastern and Southern Australia_ (New South Wales, Victoria, and South Australia) the tropical element, so abundant in Queensland, almost entirely disappears, the last operculate (a _Helicina_) only reaching Port Macquarie, though several species of _Helicarion_ occur in the extreme south. _Hadra_ is still abundant in New South Wales (18 sp.) and S. Australia (10 sp.), but becomes scarce in Victoria (2 sp.); New South Wales has also one _Panda_ and two _Thersites_. _Cystopelta_ is common with Tasmania, and one of the Janellidae (_Aneitea_) with Queensland. The carnivorous snails are represented by _Rhytida_. _Caryodes_, a bulimoid group perhaps akin to _Liparus_, is common with Tasmania only.