P R E FA C E
I n its general treatment of the subject this volume follows the lines of The
Deer o f A ll Lands; generic and sub-generic groups, as well as species and
sub-species, being, so far as pqjjable, made to have the same relative rank as
in the latter. A similar prominent position is also given to the English
names of the various animals described.
Much that appears;Mn the introductory portion of the companion
volume has a bearing on the present work. And it has accordingly been
deemed unnecessary to repeat either the distinctive characteristics of the
group Pecora, the subdivisions of the Tertiary period, or the names and
limits of the geographical regions into which the surface of the globe may
be divided ; all these being detailed in The Deer o f A ll Lands.
One feature o f the latter—the numerous photographs of living animals
—will be missed in the present volume. But this is unavoidable, as there
IP 110 collection in this country of the animals described in the sequel
comparable with the one which afforded the illustrations in question.
While the majority of the plates have been drawn by Mr. J . Smit, a few
are from original and, with one exception, hitherto unpublished sketches
by Mr. Joseph Wolf. For permission to reproduce these the author is