244 THE AURIFEROUS GRAVELS OF THE SIERRA NEVADA. 
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animal containing molar teeth. These are the last pair of temporary molars, 
and the succeeding pair of permanent true molars in functional position, and 
the crown of the last true molar visible through a fracture within the jaw. 
The teeth are tolerably well preserved, though generally much fissured, and 
appear completely fossilized. The specimen is partially imbedded in a mass 
of coherent auriferous gravel. All distinct appearance of ossific texture in 
the jaw fragment is obliterated, and it looks as if it had been a layer of plastic 
clay rudely and very roughly modelled into the form of the portion of the 
jaw containing the teeth, and mingled with some of the gravel in which it 
is imbedded. The size and form of the corresponding parts agree with the 
upper jaw first described [that from Chili Gulch], so as to render it probable 
that the specimen belongs to the same species.” 
A portion of the Chili Gulch jawbone, from one of the condyles, was 
analyzed at the request of the writer by Mr. Sharples, with the following 
results: 
Phosphate of lime. : ; ; : . 49.40 
Carbonate of lime . ; ‘ ’ ° : 18.33 
Fluoride of calcium . ; : Kont aha te al er 
Silica. : ; 5 ‘ : ‘ : 22.70 
Oxide of iron . : ‘ : : i . 4.58 
Magnesia ; : ; : : : : Trace 
99.78 
The Douglass Flat locality also furnished a unique specimen, a single 
tooth, which is thus described in Leidy’s notes: “ Not less remarkable than 
the discovery of the former remains [the rhinoceros jaws] is the finding of 
an incisor tooth, apparently indicating a species of the extraordinary pachy- 
derm Lvotherium. The incisor appears to be the right lateral one of the 
upper jaw, and may perhaps belong to one of the species detected in the 
Mauvaises Terres of White River, Dakota, though from its size I suspect it 
belongs to a larger species than either of them. The crown of the tooth 
is conical, compressed from within outwardly, and subacute laterally. The 
apex is rounded; the base somewhat expanded, and at its fore part pro- 
duced in a short embracing ridge. The fang is conical and curved. The 
tooth is twenty-nine and a half lines long; the crown thirteen lines; its 
breadth nine lines, and its thickness six and a half lines.” 
This was considered by Leidy as probably indicating a new species, and 
named by him Lvotherium superbum,* and of it he says, “ Perhaps the same as 
* Extinct Mammalia, &c., p. 388. Also Proc. Philadelphia Academy of Natural Sciences, 1868, p. 177. 
