vy 
PREFATORY NOTE. 
The accompanying plates were prepared and printed by the United States Govern- 
ment for the Report on Tertiary Vertebrata by E. D. Cope, forming Volumes III and 
IV of the final report of the Geological and Geographical Survey of the Territories, F. Y. 
Hayden in charge. The first part of this Report (Volume III), treating of the Eocene 
and a part of the Oligocene vertebrates was completed and published in 1885. The 
second part, treating of the remainder of the Oligocene and all the Miocene vertebrates, 
was never completed. A large number, but not all, of the plates for this part were pre- 
pared and printed, together with seven plates for a contemplated report on Permian 
Vertebrata. 
The specimens illustrated are contained in the Cope Collection, purchased by the 
American Museum of Natural History. The ownership of certain parts of the collec- 
tion having been satisfactorily adjusted it seemed proper that the plates should be 
distributed for the benefit of palzeontologists, jointly by the United States Geological 
Survey and the American Museum of Natural History. The plate descriptions were 
prepared and the plates bound and distributed by the latter institution. 
Illustrations of many of the specimens here figured, copied from these plates, have 
been published by Professor Cope, chiefly in the American Naturalist of 1880-1888. 
The nomenclature and identification of the material has been materially changed since 
1880-1883 when the illustrations were made, and it has been thought advisable to give 
in the plate descriptions both Cope’s identifications and the revision now current (1915). 
No text is known to have been prepared by the author, but the substance of his views 
and interpretations of the later Tertiary vertebrates of Western America may be found 
in his numerous publications dealing with fossil mammals, chiefly in the American 
Naturalist, and Proceedings of the American Philosophical Society, between 1880 and 
1892, also in Bulletins and Annual Reports of the U. S. Geol. Geog. Sur. Territories, 
1872-1882 and the Texas Geological Survey Reports, 1891-1893. 
A number of plates illustrating the Brontotheriide of the Oligocene of Colorado 
are included in the Monograph of that family by Henry Fairfield Osborn, and are omitted 
from the present series. 
SCHEDULE OF PLATES. 
Permian Vertebrata. Twelve plates; Nos. 1, 3, 7,8, 10, 11, 12, 13, 16, 16a, 19, 22. 
Oligocene Ungulata. Fifteen plates; Nos. 102, 104, 105, 108, 109, 109a, 110, 110a, 
ik, Ths ahiB, bist, wali, Waleyy eG. 
Miocene Carnivora and Rodentia. Seven plates; Nos. 118, 118a, 118b, 119, 119a, 
119b, 119¢e. 
Miocene Proboscidea. Five plates; Nos. 120, 121, 122, 123, 124. 
Miocene Rhinoceroses. Twenty plates; Nos. 125, 126, 127, 129, 150, 131, 132, 133, 
134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 144b. 
Miocene Equide. Seven plates; Nos. 145, 147, 148, 148a, 149, 150, 151. 
Miocene Camelide. Two plates; Nos. 153, 154, 
