‘Dr. I . Wyman on Fossil Bones from Memphis, Tonks mys 
4 in Picafdy,* in the Peat ‘of Flanders, and on the shores of Lake 
% ‘In this country Prof. Spencer F*. Baird, in an interesting com- 
amiinication to the American Aésociation for the Advancement of 
‘Science, states that in one of the caves in Pennsylvania, he has 
f the remains of recent beavers associated gvith bones of re- 
i 
. cent. of the whole, of extinct species.t I have mot been able to 
find any notice of remains of beavers found in the United States 
in a fossil condition. At present, beavers are confined to, the 
more northern districts, extending as far as the Mackenzie river, 
a lat. 67° or 68°, thot ugh w e have occasional notices of their exist- 
—. Ing as far south as the mountains of North Carolina, (S. B. Buck- 
— Teysin Am. Journ. a vol. iui, [2], p. 434,) and in several places 
i (Prof. R. T. Bru umley in Am. Jour. Sc., vol. iv, 
mar. 
wo 
“maven 
b] 
| po Ala., and Flanders county, Ky. De Bachman thinks 
| th formerly existed over the whole continent as a3. sbuith as 
| the tropic Cancer.{ 
| No. 1. Mastodon giganteum.—This was one of the earlier 
teeth ofa young Mastodon ; the longest diameter of the crown 
18 inch ; its transverse diameter at the posterior edge was 
16 ffich:. -and at the anterior 1-2 inch, allowance being made for 
the enamel which is in part deficient. The points of the crown 
ee been entirely worn off, the come ne surface is quite oblique, 
highest on its outer edge, somewhat excavated, and very beauti- 
fally polished. At the posterior inner aigle the crown is worn 
low the level of the enamel, but on its outer face remains of 
‘the bases of three ridges are still visible, invested with their coat- 
ing of enamel. 
he remains of two roots or fangs still exist, one of which 
_ had been almost wholly absorbed, and the other had the length 
= of an inch, although absorption of its extremity had obviously 
taken place. The small size of this tooth, together with the ex- 
_ istence of but three ridges on the crown, indicate that it was the 
third tooth i in the series. 
than the Sseniling: wn was more worn, its su less 
oblique and more deeply excavated Nig one of its margins, 
vestiges of three ridges remain, and in addition a vestige of a 
rudimentary fourth ridge. ‘The longest easniee of the grinding 
lace was 2-7 inches; its larger transverse diameter 2:1, and its 
Foss., tome bry P. 108, 4th edit., 
of Science " Cambridge, 1849, p. 352. 
. Quad. of America, vol. i, p. 356. 
8 
