X 
CONTENTS 
CHAPTER IY 
THE FAUNA OF ALASKA 
PAGE 
On the general features of Alaska, its glaciers, volcanoes and flora — 
Conditions of Alaska during the Glacial Epoch — On the evidences 
derived from the fossil mammals as to the former climate of 
the country — Evidences of an Asiatic invasion of animals into 
Alaska—The faunistic affinities of Alaska — On the former 
presence of the mammoth in Alaska—The fresh-water fishes of 
Alaska—The distribution and origin of the butterflies belonging 
to the genus Parnassius — On the mammals peculiar to Alaska — 
On the relationship of the marine mollusks of the northern 
Pacific in recent and past times—Evidences of a former land 
bridge near Bering Strait ....... 74-100 
CHAPTER Y 
THE ROCKY MOUNTAINS AND THEIR INHABITANTS 
The region of the Great Salt Lake —Distribution and origin of the 
mountain sheep and Rocky Mountain goat—-On the geological 
history of the American deer tribe — the prong-horn antelope 
and its origin — On the Rocky Mountain flora — Accidental 
distribution as applied to butterflies — Description of the 
American game preserves—The great Tertiary deposits and 
their contents ......... 101-122 
CHAPTER VI 
THE ANIMALS OF THE EASTERN STATES 
On the poverty of lizards in this region — The snakes of the eastern 
states and their affinities—The origin and distribution of the 
garter snakes — Rattlesnakes and their range—On American 
tortoises and turtles—The giant salamanders of America and 
Asia — On newts and their allies — The relationship of the 
Eastern plants—The pine-barren flora—The range of the 
star-nosed mole ......... 123-143 
CHAPTER VII 
THE FAUNA OF THE CONTINENTAL BASIN 
Description of the prairie region and its inhabitants — On the extinc¬ 
tion of the horse in America and the geological history of the 
horse tribe — Prairie dogs and their distribution — On the origin 
and past history of the raccoon—On caves and their contents as 
illustrating the geological history of the fauna—The former 
