Diplomphalus 1 Rhytida 10 Elaea 1 Parmacochlea 1 Helicarion 7 Nanina 3 Hyalinia 10 Thalassia 4 Charopa 5 Patula (?) 4 Macrocyclis (?) 1 Helicella 10 Planispira 8 Hadra 51 Chloritis 5 Pedinogyra 1 Thersites 1 Papuina 6 Panda 2 Helix (inc. sed.) 6 Bulimus (?) 1 Stenogyra 1 Tornatellina 4 Pupa 3 Vertigo 4 Perrieria 1 Succinea 3 Vaginula 1 Janella 1 Georissa 1 Pupina 16 Hedleya 1 Callia 1 Diplommatina 3 Ditropis 2 Dermatocera 1 Helicina 8 (_c_) _The Melanesian Province_ includes those islands on which the remarkable group _Placostylus_ occurs, the metropolis of whose distribution is New Caledonia. These islands are very possibly the remains of what was once a much wider extent of land. A single species of _Placostylus_ occurs both on Lord Howe’s I. and in the North I. of New Zealand, but this fact, while highly interesting as indicating a possible former extension of land in a south-easterly direction, is hardly sufficient to bring these islands within the province as now limited. The Solomon Is., although containing _Placostylus_ as far to the west as Faro I., form, as has been already stated, a transitional district to the Papuan province. _New Caledonia._--The chief features of the Mollusca are the remarkable development of the helicoid carnivorous genera _Rhytida_ (30 sp.) and _Diplomphalus_ (13 sp.), and of _Placostylus_ (45 sp.). There is a stray _Papuina_, and a peculiar form _Pseudopartula_, but _Helix_ has almost entirely disappeared. Polynesian influence is represented by _Microcystis_ (3 sp.), the so-called _Patula_ (13 sp., many of which are probably _Charopa_), _Tornatellina_ (2 sp.), and _Helicina_ (20 sp.). _Partula_ does not reach so far south, but there are two species of _Janella_. The recurrence of _Melanopsis_ (19 sp.), absent from the whole Oriental region, is curious, and forms another link with New Zealand. The curious sinistral _Limnaea_ (_Isidora_), common with Australia and New Zealand, is abundant. [Illustration: FIG. 215.--_Placostylus caledonicus_ Pet., New Caledonia, × ⅔.] _The New Hebrides_ link New Caledonia and the Solomons by their possession of the typical heavy _Placostylus_ (5 sp.) of the former, and the lighter and more elegant _Charis_ (2 sp.) of the latter. There are 4 _Papuina_, and _Partula_ is abundant (18 sp.), but there is no evidence at present that the carnivorous genera or the _Melanopsis_ and _Isidora_ of New Caledonia occur.