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POPULAR SCIENCE REVIEW. 
quite resembling those found in the Old World, but in less 
specific variety, appeared on the American continent at a later 
period than in the Old World (none having been found of un- 
doubted Miocene age), and ultimately became completely extinct 
before the historic period. No animal corresponding to the 
Dinotherium has been found. We shall hardly, then, be pre- 
pared to look for primitive types of the race in earlier American 
formations. 
Among the most remarkable discoveries of the Eocene forma- 
tions of Wyoming, has been that of a group of animals of huge 
size, approaching, if not equalling, that of the largest existing 
elephants, and presenting a combination of characters quite 
unlike those known among either recent or extinct creatures, 
and of which there were evidently several species living contem- 
poraneously. Bones of some of these animals were discovered 
by Professor Marsh and Lieutenant Wann, of the Yale College 
exploring party, near Sage Creek, Western Wyoming, in Sep- 
tember 1870, and described by the former in the following year, 
though provisionally referred to the genus Titanotherium. 
Other remains were discovered and described by Leidy in 1872, 
under the generic name of Uintatherium (from the Uintah 
Mountains, near which they were found). Very shortly after- 
wards other portions of bones and teeth of either the same or 
closely allied forms were described by Marsh as Dinoceras , and 
by Cope as Loxolophoclon and Eobasileus. Whether these 
names will ultimately be retained for separate generic modifica- 
tions, or whether they will have to be merged into the first, it 
would be premature to attempt to decide upon the evidence 
before us. Until satisfactory grounds have been shown for con- 
sidering them to be distinct, it will be best to speak of them all 
under the name which has the priority. 
To form some idea of the general appearance of one of these 
animals, we must imagine a creature very elephant-like in its 
general proportions, elevated on massive pillar- like limbs, not 
quite so long, certainly, as those of elephants, but with the femur 
vertically placed, without third trochanter, and without pit for 
the round ligament as in those animals, the radius and ulna 
complete, and crossing, and the feet short, broad, massive, and 
with five toes on each. At first sight the skeletons of these feet 
(as figured by Marsh) show an extraordinary resemblance to those 
of the elephant, and to no other animal (see PI. CXXXVIII. 
figs. 4 and 5), especially in the form of the astragalus ; but on 
closer inspection it is seen that in the mode of articulation 
between the different bones of the carpus and tarsus they really 
come nearer to the rhinoceros and other Perissodactyles. For 
example, the upper end of the third metacarpal, instead of 
joining almost alone to thejnagnum, as in elephants, is united 
