310 
PEOBOSCIDEA. 
by an open emargination. Those of the outer side are extended transversely 
and have no accessory tubercles, but their crests are lobate, i. e., divided by 
two or three grooves extending transversely to them. The anterior of the 
three is convex in front and subconcave behind. The tubercles of the inner 
side have two accessories, one anterior and one posterior, so that a section 
is trifoliate. In addition to these, there is a median tubercle at the anterior 
base of the anterior crest, and a median tubercle on the posterior side of 
the posterior crest. There is a low heel at the base of the latter, and a 
basal cingulum on each side of the anterior extremity of the crown. 
Measurements of the superior molars. 
Length of the th.ree premolars in place. 
Length of the first premolar.. 
Width of the same.... 
Length of the second preraolar .. 
Width of the same. 
Length of the third premolar. 
Width of the same. 
Elevation of the same..... 
Length of the first true molar. 
Width of the same. 
Elevation of the crown of the same. 
M. 
0.171 
0. 0;!8 
0 . 020 
0. 042 
0. 042 
0.078 
0. 055 
0. 034 
0.120 
0. 007 
0. 052 
The external hxce of the maxillary bone is preserved in a damaged 
condition. The large foramen infraorVitale exterms looks forward and a 
little outward, and the position of the incisive alveolus is protuberant later¬ 
ally. The alveolus contains the root of a small tusk, much decayed. The 
depth from the orbit to the alveolor border measures 0’".090, and the trans¬ 
verse diameter of the foramen infraorMtale is 0™.020. 
There is a deposit of cementum in the valleys of both the inferior and 
superior molars, which does not appear in a few specimens. 
Of two separate third molars, already mentioned, one is more tubercu¬ 
lar than the other. In both, there is a cingulum between the bases of the 
cones on one side, which is lobed in the one, which also presents low 
tubercles above it in the valleys. In this tooth, no cementum is present. 
The other is without the tubercles, and cementum is present. Both are well 
worn. The more tubercular mensures 0™.073 In lengtli and ()™.()48 in width. 
A large sixth molar is similar to that already described from the lower jaw. 
