202 Miscellanies. 
then N. E., until it strikes the Mississippi river at Baton Rouge. It then 
continues on the eastern side of this river up to Vicksburg, forming the 
steep bluffs on the eastern side; it then crosses the river, and extending 
across the country, strikes the Red river at Alexandria; from thence it 
asses down southward, its eastern boundary being almost exactly parallel 
with the Bayou Beuf, lying altogether W. Fi 
of this river, and continuing on to the sea, 
but inclining more to the westward after 
it reaches the parish of Attakapas. This 
is the formation over which the prairies are 
found. It consists first of clay, composed 
of aluminous clay and sand in various pro- 
portions, sometimes almost without grit; 
next of a layer of rolled pebbles; then a 
layer of sand; then a layer of aluminous 
clay, varied red and white, sometimes in 
nodules of irregular form; then quicksand; 
and then a similar layer of variegated alu- 
minous clay. The fossils generally found 
are not in situ, but are confined to the rolled 
The fossils above alluded to were found in the first foe beneath the 
vegetable mould, that is,in the sandy clay. They were—First: a masto- 
don’s molar tooth, cpeteapeniding exactly with that figured in Cuvier’s Os- 
semens Fossiles, third edition, Vol. I, Plate Ist for Mastodon, Fig. 1. This 
tooth weighs 6} pounds. Second: a part of the right lower jaw, contain- 
ing two teeth of the mastodon, but evidently a very young animal, as they 
were not at all worn ; the whole weighs eight pounds. These teeth have 
only three ridges transverse. These were found about a mile apart. 
Thirdly : a molar, somewhat similar to the first, but much larger, and the 
transverse ridges of the crown, which were four, are worn down almost 
smooth ; weighs 12 pounds. Fourthly: a tooth which was found with this 
last, (about two miles from the two first.) It is the third molar of the up- 
per right jaw of a horse. A drawing of the crown, and oblique view of 
two sides, is given at Fig. 1; the outer side of the tooth is shown at Fig- 
2; the front side at Fig. 3. 
There are some slight deviations from the common forms of the festoons 
of the enamel upon the crown ; but differences frequently are found in the 
forms of these in living horses. From c to d, (Fig. 1.) measures an inch 
and a quarter ; from d to f, (Figs. 1 and 3.) it measures 3} inches, though 
all of the hollow or shelly parts of the roots are gone, which in common 
