134 — Cincinnati Society of Natural History. 
scalarinus, Pleurotoma moniliata, Pyrula multangulata, Solarium 
cupola, S. delphinuloides, and Dentalium microstria. 
In 1881, Prof. E. D. Cope* described, from beds supposed to belong 
to the Puerco Group, Periptychus carinidens, and Deltatherium 
Sundaminis. From the Wind river Eocene,+ Calamodon cylindrifer, 
Esthonyx acutidens, Sciurus ballovianus, Pantolestes secans, Mi- 
crosyops scottianus, Miacis canavus, M. brevirostris, Didymictis 
dawkinsianus, Ictops didelphotdes, Bathyopsis jfissidens, Lambdo- 
therium browntanum, Hyracotherium venticolum, and Phenacodus 
trilobatus ; from the Miocene of the John Day river in Oregon, 
Nimravus gomphodus, N. confertus, Coloreodon ryderanus, Paleo- 
cherus platyops, Protolabis prehensilis, and Eumys lockingtonianus ; 
and from the Amyzon shales in the South Park of Colorada, of Upper 
Eocene or Lower Miocene age, Charadrius sheppardanus. 
We have passed, in historical review, the Tertiary as it has been 
discovered, and is now known on the eastern, southern, and western 
parts of the continent of North America, leaving for further considera- 
tion, only the drift or fresh-water Pliocene and Post-pliocene of the 
central part. The reason for separating the rocks in this manner 
may be found in the fact that there is no connection between 
the marine drift of the New England States and northeastern 
shore of the continent, and the fresh-water drift or lake drift of the 
central part, and as to the western part or Rocky mountain region, it 
has never been subjected to any general drift action, though here and 
there the waters from the local lakes have left their drift in and about 
the streams that drained them. 
It may be important here to remark, that in this historical review, 
geologically speaking, we have not found any Glacial Period or Glacial 
Epoch, nor paleontologically speaking, have we found any evidence 
whatever of such a period, nor have we found any phenomenon requiring 
the intervention of such a period to explain it; but, on the contrary, 
all the phenomena are to be accounted for, without change of climate, and 
without the violation of any of the laws of nature, which are now in 
operation, and form the basis, from which the geologist judges of the 
past. And when we come to a review of the drift of the central part 
of the continent, it will appear equally as clear that no part of it was 
the result of glaciers, and that so far as North America is concerned, 
the so-called Glacial Period never had an existence. 
* Am. Nat., vol. xv. 
+ Bull. U. S. Geo. Sur., vol. vi. 
