Supernumerary Tooth in Mastodon giganteus. 349 
Ant. XXXV,—Supernumerary Tooth in Mastodon giganteus ; 
by Jonny C. Warren, M.D. 
Tue jaw which contains this remarkable tooth was found in 
the autumn of 1854 at Terre Coupie in Michigan, while digging 
a cellar, at the depth of six feet from the surface, in a sandy de- 
posit, Other portions of bone were discovered in the same place 
but not presenting anything remarkable. Fortunately it fell into 
the hands of an able geologist of Milwaukie, J. A. Lapham, Esq., 
who was competent to discover the peculiarity of the case. He 
wrote to me, gave some account of the bone, and being encour- 
ed by my reply sent a description of it to the Boston Society 
{ Natural History, which has been published, and afterwards 
procured the specimen for me. 
he measurements of this jaw are as follows: 
Length of right ramus on outer side, —- - 26 in. 
Ts ‘“ ‘“ “ inner ‘“ - - 28 in. 
ii * dental surface, Hiits oT conte s oe, 16-<im 
“© lower edge of jaw, - > - 22 in. 
Distance from teeth to beak of symphysis, 8 in. 
Circumference of thickest portion of right ramus over 
ridges of penultimate tooth, - - - - in. 
Length of left symphysial portion.) - - - 8 in. 
The number of the teeth is three. The first of these counting 
from before backwards has the form and magnitude of the fifth 
tooth in the lower jaw of the Mastodon giganteus. Its superior 
orcoronal face is quadrangular, excavated on its middle portion 
from excessive use, its internal edge though much worn elevated 
Compared to the external, which is more worn. The three ridges 
of the crown are nearly obliterated by wear, but we are able to 
discover the enamel which partially circumscribed each ridge. 
The whole of this surface has a beautiful smooth polished ap- 
pearance of a dark color excepting the enamel ridge just spoken 
of. The fangs are, in number, two supporting the anterior ridge 
and united in one common mass, and four supporting the poste- 
nor ridges also united in a common mass. ‘The extremities of 
‘Ne fangs are absorbed, so as to leave the tooth loose in its socket, 
and undoubtedly it would have been extruded had the animal 
Sometime longer. There is no appearance of cavity in the 
= 
for the anterior fangs, and two-thirds rior for the posterior 
fangs. In the alveolus of the outer is found a portion of 
