The peninsula of _Corea_ must undoubtedly be included in the Chinese sub-region. It is true that the land operculates scarcely occur, but there are still a number of _Clausilia_, and several of the characteristic Chinese groups of _Helix_ are reproduced. In some points Corea appears to show more affinity to Japan than to China, four of the _Helices_ being specifically identical with those of Japan, but the peninsula is at present too little explored for any generalisations to be made as to its fauna in this respect. (_b_) _Japanese Province._--Kobelt distinguishes four groups of Mollusca inhabiting Japan (_a_) circumpolar species, actually occurring in Europe, Siberia, or N. America, or represented by nearly allied species (these of course do not belong to the Japanese province as such); (_b_) Indo-tropical species; (_c_) species which are Chinese or akin to Chinese; (_d_) peculiar species, a mixture of two forms, southern and northern, the latter being chiefly _Hyalinia_, _Patula_, and _Fruticicola_. Out of a total of 193 Japanese species, at least 164 are peculiar. The Japanese _Helices_ belong to sub-genera common to China (_Plectotropis_ 8, _Euhadra_ 21, _Acusta_ 23?); but the Naninidae scarcely occur at all. The principal feature of the fauna is the development of _Clausilia_, which presents some extraordinarily fine forms. One slug (_Philomycus_) is identical with an Indian species. The operculates, which consist mainly of a few species each of _Diplommatina_, _Cyclophorus_, _Pupinella_, _Pupina_, _Helicina_, and _Georissa_, belong almost exclusively to the southern islands Kiu-siu, Sikoku, and southern Niphon. The three species usually reckoned as _Japonia_ are probably forms of _Lagochilus_. =C. The Australasian Region= This region includes all the islands of the Pacific east of the Moluccas, and falls into three sub-regions--the Papuan, the Australian, and the Polynesian. 1. The =Papuan Sub-region= may be divided into--(_a_) the _Papuan Province_ proper, which includes New Guinea, with the Aru Is. and Waigiou, the Admiralty Is., New Ireland, New Britain, and the d’Entrecasteaux and Louisiade Groups; (_b_) the _Queensland Province_, or the strip of N.E. Australia from C. York to the Clarence R. (about 29° S. lat.); (_c_) the _Melanesian Province_, which includes the New Hebrides, New Caledonia, with the Loyalty Is. and the Viti Is. The Solomons form a transition district between the Papuan and Melanesian provinces, abounding on the one hand in characteristic Papuan _Helices_, while on the other they form the north-western limit of _Placostylus_, the group especially characteristic of the Melanesian province.