TABLE OF CONTENTS. 
PAlRT I. 
Page. 
Letter of transmittal .. 5 
Chapter I. Geueral observations upon the collections and tbe periods they rep¬ 
resent . 5 
II. Classification. 21 
III. Fossils of the Primordial jieriod. 32 
IV. Fossils of the Canadian period. 60 
V. Fossils of the Trenton period. 62 
VI. Fossils of the Subcarboniferous period. 79 
VII. Fossils of the Carboniferous period. 96 
VI11. Fossils of the Jurassic period. 162 
IX. Fossils of the Cretaceous period. 169 
X. Fossils of the Tertiary period.. 206 
RAlRT II. 
XI. Geology of Mesozoic and Tertiary beds and fossils of the Mesozoic 
periods .. 1 
Mesozoic beds. 1 
The Eocene plateau . .. 13 
The Loup Fork beds. 20 
Mesozoic Vertebrata ... .. - 26 
XII. Fossils of the Eocene period. 37 
Pisces. 37 
Reptilia . 42 
Aves. 69 
Mammalia.. 72 
Bunotheria. 72 
Roden tia. 170 
Amblypoda. 179 
Perissodactyla. 251 
XIII. Fossils of the Loup Fork epoch. 283 
Reptilia. 283 
Aves. . 286 
Mammalia. 295 
Rodentia. 295 
Carnivora . - . 301 
Proboscidia. 306 
Perissodactyla.. 316 
Artiodactyla. 324 
IX 
