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.
Tasmania.—About 80 species of land Mollusca are known, not more than 10 being common with Australia. No land operculates occur; Endodonta and Charopa are rare, and Hadra has entirely disappeared, but Pupa and Succinea occur. Carnivorous genera are represented by Paryphanta, Rhytida, and Rhenea. Anoglypta is a peculiar section of Helix, while Caryodes, Cystopelta, and Helicarion are common with Australia. Among the fresh-water Mollusca are a Gundlachia (see p. [345]), and some forms of Amnicola or Hydrobia, one of which (Potamopyrgus) is common only with New Zealand.[373]
The Neozealanian Province.—The Mollusca of New Zealand, with the Kermadec, Chatham, and Auckland Is., are remarkably isolated. Such genera as Nanina, Partula, Pupa, Stenogyra, Succinea, Vaginula, Truncatella, Helicina, and Navicella, which might have been expected to occur, are entirely absent. The bulk of the land Mollusca are small and obscure forms, perhaps remains of a very early type, and appear to belong to the Zonitidae, neither Patula nor Helix occurring at all. The carnivorous forms are represented by Schizoglossa, a peculiar genus akin to Daudebardia, by Paryphanta, an extraordinary group of large shells with a thick leathery epidermis, and by Rhytida and Rhenea. In spite of its extreme isolation, the general relations of the fauna are partly with New Caledonia, partly with E. Australia. The occurrence of Placostylus has already been mentioned (p. [323]), and three species of Janella, a genus which also occurs in Queensland and New Caledonia, indicate the same affinity. Otoconcha is peculiar. The fresh-water Mollusca, besides the Isidora characteristic of the sub-region, are partly related to New Caledonia through the occurrence of Melanopsis, partly to Tasmania through Potamopyrgus, while the peculiar Latia is possibly akin to Gundlachia (Tasmania). The land operculates number only 5 genera and 14 species in all, excluding a doubtful Diplommatina.[374]
Land and Fresh-water Mollusca of the Neozealanian Province
| Schizoglossa | 1 |
| Paryphanta | 5 |
| Rhytida | 6 |
| Rhenea | 2 |
| Helicarion | 1 |
| Otoconcha | 1 |
| Microcystis | 1 |
| Trochonanina | 1 |
| Phacussa | 3 |
| Thalassohelix | 5 |
| Gerontia | 2 |
| Allodiscus | 10 |
| Pyrrha | 1 |
| Therasia | 7 |
| Phenacohelix | 3 |
| Suteria | 1 |
| Flammulina | 13 |
| Laoma | 23 |
| Endodonta | 10 |
| Charopa | 28 |
| Placostylus | 1 |
| Carthaea | 1 |
| Tornatellina | 1 |
| Janella | 3 |
| Latia | 2 |
| Ancylus | 2 |
| Limnaea | 5 |
| Amphipeplea | 2 |
| Planorbis | 1 |
| Isidora | 7 |
| Melanopsis | 2 |
| Potamopyrgus | 4 |
| Paxillus | 1 |
| Lagochilus | 7 |
| Omphalotropis | 1 |
| Realia | 4 |
| Hydrocena | 1 |
| Unio | 9 |
| Sphaerium | 1 |
| Pisidium | 2 |
Lord Howe’s I. is remarkable as containing a Placostylus, which thus links the island with this province. The remainder of the fauna is Polynesian, with the exception of a species (common to the Fijis) of Parmella, a slug akin to Helicarion, Parmacochlea, and Cystopelta.
(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 Paumotus in the east, and from the Tonga group in the south to the Sandwich Is. in the north. It may be subdivided into (a) the Polynesian province proper, and (b) the Hawaiian province, which includes the Sandwich Is. only.
