[[p. 405]] The following list has been drawn up principally with the view of recording the localities of the various species collected by me, and thus furnishing materials towards a more accurate knowledge of the geographical distribution of these animals. Of the 125 species in the list, upwards of fifty were first obtained by myself; and of a considerable number of the others, accurate localities are now for the first time given. The restricted range so characteristic of land shells is well shown by my collection, no less than ninety species, or more than two-thirds of the whole, being confined each to a single island. The difference between the faunas of the Indo-Malayan and Austro-Malayan regions is also well marked, a number of characteristic genera and species of true Helicidæ being peculiar to the latter; while only four of this family were found by me in the former region. The true thick-lipped Bulimi are quite absent from the Moluccas and New Guinea, as they are from Australia; while they abound in the Indo-Malayan islands, and have extended thence into Celebes and through the islands east of Java as far as Timor.

     The various species have been named by comparison with the type specimens in Mr. Cuming's collection; and to Mr. H. Adams's kind assistance are due the determination and arrangement of the genera and families. He has also described the eight species which are unique in the collection.

     With a very few exceptions, all the shells comprised in this list now form part of the collection of William Wilson Saunders, Esq.