from the Tertiary Formation. 39 
species. The first premolar has but one fang, and between this 
and the symphysis there are no teeth. On the inner face of 
each ramus there is a shallow, sickle- -shaped impression, with the 
point directed forward, and terminating under the first premolar. 
Measurements. 
Length of portion of lower jaw, with six posterior teeth, “ps Z lines. 
Length of same with three posterior teeth, __._.---- 
Antero-posterior diameter of last lower molar, = 
Transverse diameter of same,..-..---------------- 2° 
The above specimens were discovered by C. T. Ballard and the 
writer, on the north side of the White River, in Eastern Utah. 
The geological horizon is upper Eocene, or lower Miocene. 
“ce 
“ce 
Lophiotherium Ballardi, sp. nov. 
A small Pachyderm, apparently nearly related to the genus 
Soap yale is indicated by a fragment of a right lower jaw, 
with the last two molars, and a few less important remains. 
ci species thus represented appears to have been about two 
Lo 
by Dr. Leidy from the same Terti ich these fos- 
sils were found,* and the teeth, so far as a a nearly the 
same composition. Those preserved in the present specimen 
are somewhat worn, showing that the — -_ fully adult. 
The enamel, especially on the sides of the crown, is muc 
wrinkled, and thus the external basal ridge is cided strongly 
serrated. 
Measurements. 
as —. of last lower molar, ‘4-4 lines. 
Transverse diameter of s Bie ew a5 = 
Antero-posterior Sane of. penultimate lower molar,. 3:2 
Transverse diameter of sa Wi oa 2°25 
The species is named for ‘se discoverer, Mr. C. T. Ballard, oo 
the Yale party, who obtained the specimens here deseri ibed a 
Grizzly Buttes, Western Wyoming. 
oe 
“ 
Elotherium lentus, sp. nov. 
sence of numerous Suilline Pachyderms in the Green 
ioe Y Perlar basin was clearly established during the inves- 
ge of our party by the discovery of _— extinct species, 
rent from any hitherto descri One of >: — 
evidently aes Oy to the genus Elotherium, is represented oS 
single fragm a left lower jaw, with the last molar in fine 
preservation. This, specimen indicates a species about one half 
the size of Elotherium Mortoni Leidy, which is comparatively 
abundant in the lower Tertiary deposits east of the Rocky Moun- 
* Proceedings Philadelphia Academy of Natural Sciences, 1870, 126. 
