OF MASTODONS, WITH REMARKS, ETC. 
15 
their successors advance forwards. The number of teeth which are in 
use in the young animal represented in Plate XXVI. at the same time 
seems to have been twelve, but probably at a more advanced age was 
usually not more than eight; and in old age only four. The fact of the 
jaws represented in Plates XXVIII. and XXIX. having belonged to 
adult animals is thus conclusively established, all the teeth having been 
lost, except the posterior molar in each jaw, and that has advanced 
considerably forward and is much worn. 
We subjoin the admeasurements of various teeth, appertaining to the 
lower jaw of the animals under notice. 
Tooth. 
Dimensions of Crown in inches. 
SPECIMEN". 
Length. 
Breadth. 
I. 
1.5 
1.1 
Peale’s Museum, New York, PI. XXVI. 
1.4 
1 
Academy of Natural Sciences—described in Fauna 
Americana as the Tapir Masioclontoideus. 
2. 
1.8 
1.55 
Peale’s Museum, New York, PI. XXVI. 
1.7 
1.5 
Finnel Collection, New York. 
3. 
8.1 
2.2 
Peale’s Museum, New York, PI. XXVI. 
2.9 
1.9 
Cabinet of Mr Lea. 
3.3 
2.5 
Cabinet of American Philosophical Society, PI. XX. 
3.2 
2.5 
French Museum,* figured by Cuvier. 
4. 
3.7 
2.8 
Peale’s Museum, New York, PI. XXVI. 
4.1 
2.7 
Cabinet of American Philosophical Society, PI. XX. 
3.8 
2.6 
French Museum,* figured by Cuvier. 
5. 
4.6 
3.5 
Cabinet of American Philosophical Society, PL XXIV. 
4.5 
3.3 
Cabinet of American Philosophical Society, PI. XXV. 
5.8 
3.7 
Wistar Museum, PL XXI. 
4.4 
3.4 
French Museum, figured by Cuvier. 
4.3 
3.2 
Philadelphia Museum. 
4.9 
3.6 
Virginia University, Pl. XXVII. 
6. 
8.1 
4.3 
Wistar Museum, Pl. XXI. 
6.9 
3.8 
Cabinet of American Philosophical Society. 
7.1 
3.7 
Baltimore Museum, PL XXIII. 
7.2 
4.1 
Cabinet of American Philosophical Society, PL XXIX. 
6 
3.4 
Cabinet of American Philosophical Society, Pl. XXVIII. 
7 
3.8 
Cabinet of American Philosophical Society, PL XXIV. 
6.5 
8.6 
Cabinet of American Philosophical Society, PL XXV. 
* 
7 
3.5 
French Museum, figured by Cuvier. 
7.1 ' 
3.7 
Philadelphia Museum. 
* Same jaw. 
