XX PREFACE .TO NEW EDITION 
drawn for this book, and are based on the admirable restorations 
by Miss Alice B. Woodward, seen in Plates XLIV., XLV., XLVI. 
The latter have been kindly lent by Mr. H. R. Knipe, F.L.S., who 
published them a few years ago in his beautifully illustrated 
book Nebula to Man. From the same book the writer has also 
borrowed Plates XXIII. and XXVI., representing respectively 
Tguanodon and Stegosaurus. 
As explained in the text, the fossil bones of the elephant’s 
ancestors have been discovered chiefly by Dr. C. W. Andrews of 
the Natural History Museum, who has also been so fortunate 
as to discover the skull and large portions of the skeleton of 
that very strange Mammal, the Arsinoétherium, seen in Plate 
XLIII. This also may be reckoned among the recent wonders 
of Geology. 
The evolution of the horse, quite an old story now, has been 
brought up to date and further illustrated by the outline 
restorations taken from Mr. H. 8. Lull, and by the Figs. on p. 245, 
which have been carefully drawn from casts of skulls and limb- 
bones in the Natural History Museum. 
In the last two chapters will be found an epitome of recent 
information about the great Ground Sloth of South America, and 
the Diprotodon, a huge Marsupial from Australia. 
The Trustees of the British Museum have kindly lent the 
following : Figs. 29, 31, 32, 37, 50, 77, 84, 99, 100, 101, 102, 103. 
Dr. Henry Woodward, Editor of the Geological Magazine, 
has kindly supplied Fig. 60 of the Polacanthus, as well as Plates 
PLE Ve and bY: 
In conclusion, the writer wishes to thank Dr. A. Smith 
Woodward, F.R.S., of the Natural History Museum, who, besides 
reading the proofs of this book, has from time to time offered 
suggestions and criticisms of sketches for which the writer is 
