Castoroides Ohioensis. 391 
Although attaching little importance to the discovery of 
Wood gnawed by beavers in these swamps, I may notice, in 
connection with the present example by General Adams, 
following : 
“Mr. Williams, one of the assistant engineers, has informed 
me, that at the summit level of the Genesee Valley Canal, at 
New Hudson, four miles from Cuba, several deers’ horns and 
the horn of an elk, [ Elaphus canadensis,] were found twelve 
feet below the surface, in a muck deposit. In the same situ- 
ation, a piece of wood gnawed by beavers was also found. 
These are all the remains of existing animals, but their posi- 
tion is the same as that in — the remains of the mastodon 
are found." : 
From the few facts which have come to our notice, we are 
induced to believe that the geographical distribution of this 
animal must have been very extended ; for its remains have 
been discovered in New York, in Ohio, and, as we have been 
recently informed, in the neighborhood of Natchez. 
H. ANATOMICAL DESCRIPTION OF THE CRANIUM. 
Among the fossil remains of extinct Mammalia heretofore 
discovered, those of Rodents do not appear to have been 
'undant, nor remarkable for their size. In no instance, ex- 
cepting that of the Castoroides, have they excelled or even 
equalled the bones of the existing Capybaras of South Amer- 
ica, which are by far the most gigantic Rodents belonging to 
the actual condition of the globe. The largest fossil species 
referable to the order above mentioned, belong to the ses 
Castor * ( C. Europ«eus, ) and Trogontherium,’ (T. Cuvieri, 
2 Geolotieal Re k, p. 367, note. 
port, Fourth District, New York, p. 
e en British Fossil Mam anh Birds, p.190; C. iced 
Umen Wer t L p.55; C. fossilis, Goldfuss 
ihe T. Xt. Ld Trogonth. Werneri, Fisch., Mem. de la Soc. des 
c en onth. Cuvieri,, carts Mem. de Iw des. Nat. de Moscow, T. II. p. 250; 
tragonth. Cuv., Oss. Foss. T. V. Pt. L p. 59; T. Cuvieri, Owen, British 
Foss, Mam. and Birds, p. 184. 
