308 REVIEWS. 
pertain to the subgenus Tetralophodon, while those of the quaternary period belong to the 
er emgins ‘of kiephas probably indicate a species herd from the quaternary E. a 
h it is not posi y d. The ain E 
from thos he E. fraternus, Th s Bip parion is clearly common to both the 
pliocene and quaternary perio ut the species are different otohippus, one of the soli- 
pedal genera of the Niobrara pliocene, appear: ave existed during the quaternary 
s also to 
period, in Obi. oath America. A small —_ of Poe of the Niobrara pliocene, is re- 
presented by n 
T 
he quaternary fauna Sad both American continents was ane rey. seenguiened n the 
eg 
-+ 
n sloths, no trace of w 
prese 
the tertiary aas of North America. 
cumstane «Te esi remains of 
ations of Eon 
je presence o nad d fauna of North America of the great sloths, together with 
This appears the ne repareabie from the Vias 
other ordinal and ge c forms, w kewise existed, and in part still continue to exist, iu 
South America, Med to ihe hopresetor that the North American continent during the 
Th r similitude of thé 
hick l g he p k, with the contem- 
poraneous oe of De mes world, ugg he p lity that the North American continent 
P 
from. a continent whose a Mer w forms the bottom " the great Faci > bns 
tiary t 
ana of Asia with its peninsula. Europe, o on nthe other, 
h he 
remains fro om the Mauvaises Terres and the Niobrara River, we observe the slink A act 
that upwards of fifty = cniin belonging " the T faunæ together, seuroey a genus is com- 
mon to bo "S In view o ft 
he 
41 1 . 
Thus, for instance, t the pliocene Merychyus s y bed "od as identical oes 4 with 
eo 00) on as 
e Vi id ocene Rhino- 
ros occide: ppears to have been an Aceratherium, while that of the pliocene formation 
was probably a true or horned Rulsoesnds. 
t, those of Dakota and Nebraska, under consid- 
eration, appea in thei p with the tertiar unz of Europe. 
Of the seridbrons of the former | liti prising . 
the genera, or more than one-h If, f : Can 
Amphicyon, Hysnodon, eerste and Drepanodon. The feline Diets o of the Buen 
miocene has not elsewhere been vered. The re o carnivorous genera are too 
gph tate nowh for compariso n. 
It is ur R i d 1 
that b f i , none, excepting the genus s Cervus, bel gs t y other kno 
fane ‘cuties’ or rece; f th iti ble tl f the 
remains attributed to k may belong to a peculiar subgenus, while others may be of a recent 
species. 
p the North Amer ings fexnary nee quaternary 
ruminants, " fiud pemnrkapie differences, A liar famil 
P 
e latter 
by a single genus. This family has nowhere in been discovered, neither in the American 
quaternary nor the foreign tertiary PM CHE 
Another v: the Agriochcerida, nearly allied to the former, is peculiar to the miocene 
of the Mauvaises Terres. 
p and quaternary de- 
posits, but partieularly in the miocene, and they are yet represented in the existing fauna of 
South dienen. 
The M 
osch 
E y but not in 
the l later formations of " North. cita. 
erica. The 
— are represented by a genus in the Niobrara pliocene. The SOT: and Bovide 
represented in North America prior to the quaternary period, 
