The Preface and Introduction to my "Mammals of Australia" having been set up in small type for facility of correction, I have had a limited number of copies printed in an octavo form, for distribution among my scientific friends and others, to whom I trust it will be at once useful and acceptable. They must however still regard it rather in the light of a proof-sheet, inasmuch as it contains many imperfections, which have been corrected in the folio edition.