PROBOSCIDEA. 
309 
Lenglh of the fifth molar.v. 0.113 
Width of the same... 0.072 
Length of the sixth molar. 0.158 
Width of the same in front... 0. 070 
Width of the same behind..... 0. 060 
Elevation of the anterior cone of the same........ 0. 060 
Tlie superior series of molar teeth was found in place, and I took them 
from the matrix attached to the maxillary bone. The fourth molars, or first 
true molars, of both sides, were found inclosed within the jaw. The first 
premolar is smaller than the second; it was broken otf, but the relation to 
the second here described is probably the true one. It presents a prominent 
anterior transverse crest, and a low posterior one, with a small external 
tubercle representing a heel. The anterior crest is continuous, and is three- 
lobed; the second consists of two well-separated low tubercles. The second 
molar is also furnished with two crests, which are subequal in elevation. 
Each one is divided by a median notch and fissure, of which the posterior 
is the more open. The anterior internal and posterior external tubercles are 
simple, the latter transverse from compression. The antero-external and 
postero-internal are lobate, the former with two lobes, the latter, which is 
the least elevated of all, with four lobes. There is a weak basal cingulum 
on each side and behind, but none in front. 
The third premolar, which, according to Owen, belongs to the milk 
series, is furnished with three transverse crests, of which the posterior is the 
least elevated. Each of these is divided by a deep fissure, since it consists 
of two appressed cones. The cones of the outer side are simple and trans¬ 
versely oval in section; the inner ones possess each an accessory tubercle 
in front and one behind at their inner border. The accessory tubercles of 
adjacent crests are in close contact, thus blocking up the intervening valleys 
at their middles. The inner cone of the posterior pair has no posterior 
accessory tubercle on one side, but there is a strong posterior cingulum. 
The lateral cingula are only developed between the bases of the cones. 
Anterior cingulum narrow but uninterrupted. The first true molar is half 
as long again as the last premolar, and, like it, has three crests. As they 
are unworn in this individual, they have the following characters. The 
principal cones of opposite sides are opposite to each other and separated 
