PREFACE. 
IV. 
employed in a very wide sense, and I am more and more convinced that this view 
is the preferable one, as the multiplication of such terms can but encumber the 
science without giving any adequate advantage in return. 
I may mention that the references to non-Siwalik vertebrates do not usually refer 
to the first publication of the names, but merely to good descriptions or figures. 
i have again to express my thanks to many of the Officers of the Zoological 
and Geological Departments of the British Museum (Natural History) for much 
valuable assistance ; and thanks are also due to the Director of the British Museum, 
and to Professor Boyd-Dawkins, of Owens College, for some of the woodcuts 
illustrating this volume. The readers of this and the preceding volume are deeply 
indebted to Miss G. M. Woodward and the other artists for the accuracy and ex- 
cellent execution of the figures of the specimens. 
RICHARD LYDEKKER. 
The Lodge, 
Harpenden, 
Hertfordshire. 
March 1st, 1886. 
