38 O. C. Marsh—Notice of some new Fossil Mammals 
Measurements. 
Length of portion of upper jaw, Spetaiuing seven pos- 
ee SOOGD a a ie 49 Sy oP ewe > sens ene ae 26° lines. 
Length of same, with three last molars,..........---- 138-7 “ 
Antero-pos arate ee a of last upper a eet as 5: 
Transverse diameter of same, ---- Soh = 
The remains now known to represent this species were dis- 
covered by C. W. Betts, H. B. Sargent, and the writer, in the 
Tertiary strata at Grizzly Buttes, near Fort Bridger. 
Lophiodon pumilus, sp. nov. 
A still more diminutive species, of the same, or a nearly re- 
lated, genus, is indicated by several specimens, including a frag- 
ment of a left upper jaw, containing three premolars and the two 
Rascenntiige molar teeth. The species may easily be ela 
from the small one above described, by the presence, on the out- 
side of the superior teeth, of a str ong, continuous, but frregrulas 
basal ridge, which, at the external angle of the crown, replaces 
the elevated tubercle present in all the molars of the species al- 
ready noticed. The present specimen may also be distinguished 
om L. nanus, by the form of the last two upper premolars, 
which in the latter have their greatest transverse diameter be- 
hind the center, while the reverse is true of these premolars in 
the species under consideration. 
Measuremenis. 
Length of portion of upper jaw, with three premolars, 
Faves Pe NGI oe Soe es ee, 14° lines. 
ro-posterior opened of penultimate upper molar, 3°25 
Transverse diameter of sa: is ee 4° 
The only specimens at present known to represent this species 
were found by C. T. Ballard, in the Tertiary beds near Marsh’s 
Fork, Western Wyoming. 
Anchitherium gracilis, sp. nov. 
The Green River Tertiary basin of Wyoming apparently con- 
tains very few extinct solipedal mammals, one or two fragments 
only being all our party secured during several weeks of explo- 
rations. Te the Uintah or southern basin, however, especially 
near the White River of Eastern Utah,* remains of this group 
are more abundant, and some characteristic specimens were ob- 
eerie Among these, were three lower jaws, with many of the 
preservation. They represent an animal less than 
one half the size of Anchitherium Bairdi Leidy, and sammie, 
belonging to the same genus. There are seven premolar and’ © 
molar teeth, with essentially the same constitution as in ial 4 
* This Journal, vol. i, p. 196, March, 1871. 
