Note.—In this Index the names in Italics all refer to fossil genera or families mentioned in Part II. The systematic names of genera and families occurring in almost every page of Part III. are not given, as they would unnecessarily swell the Index; but they can be readily referred to by the Class or Order, or by the Geographical Division (Region or Sub-region) under which they occur. They will, however, all be found in the General Index, with a reference to the page (in Vol. II., Part IV.) where a systematic account of their distribution is given.