THE ANNALS 
AND 
MAGAZINE OF NATURAL HISTORY. 
No. 111. MARCH 1846. 
XXI.—On the Osteology and Dentition of some North American 
Mastodons. By Joun C. Warren, M.D. 
To the Editors of the Annals of Natural History. 
GENTLEMEN, 
I BEG to communicate to you the following letter which I have 
received from Dr. Warren of Boston, an excellent anatomist and 
eminent physician. It contains so many important observations 
on the osteology and dentition of some of the most complete ex- 
amples of the North American Mastodon, as leads me to believe 
you may give it a place in your next number of the ‘ Annals,’ 
I am, Gentlemen, your very obedient servant, 
London, Feb. 16th, 1846. RIcHARD Owen. 
My pear Sir, Boston, Jan. 31, 1846. 
The mterest you have taken in the anatomy of the Mastodon 
giganteus, and the clearness with which you have elucidated 
many points of their anatomy, lead me to address you at this 
time. 
In the autumn of 1845 the skeleton of a Mastodon, accom- . 
panied with two perfect heads, two additional lower jaws, and 
various other bones, which had been exhumed in the State of 
New Jersey, was brought to this place. On examination I found 
it to be the most perfect specimen, which, so far as I knew at that 
time, had been discovered; I therefore proceeded to examine it 
with some care, and in the early part of November last made a 
detailed report of its anatomy to the American Academy of Arts 
and Sciences, accompanying this report with several drawings, . 
Two of these drawings were of the whole skeleton ; the third was 
of one of the other heads. By the liberality of a number of gen- 
tlemen of Boston all these specimens have become the property 
of Harvard University at Cambridge, three miles from Boston. 
In the month of August last we had rumours that the ske- 
Ann. & Mag. N. Hist. Vol. xvii. M 
