0. C. Marsh—New Tertiary Mammals. 217 
The ah Bi sags. was found by Mr. O. Harger, near 
_ Henry's Fo 
an vulpinus, sp. NOV. 
ing, may be base t of a lower jaw containing the last 
premolar. ae sthies Toil specimens probably belong to 
the same spec The premolar has the Stor tuberele pro- 
Measurements. 
Space oeeupied by four lower premolars,.........+-++++> oa 
Snes a diameter of last premolar, ee ee 7 
Transverse di OEOH is ven es peak penn ween ee od 2°3 
Height aioe: OUR W is in Ca oo eh eke ee eee 43 
Depth of j jaw below ldat preingtar ois oa Sh ecee ss 8° 
The known remains of this species were found a Me. T. G. 
Peck, in September last, near Henry’s Fork, Wyoming 
Orotherium Uintanum, gen. et sp. nov. 
This genus is near ly allied, apparently, to Lophiotherium, but 
differs from the known remains of that genus in having, on the 
second ate remolar, a prominent posterior tubercle. In the 
true lower molars, also, the anterior inner cone is slightly bifid, 
@ character not indicated in the figures given of the correspond- 
ing teeth of Lophiotherium. The present species is based on a 
nearly entire lower jaw, with the last six teeth in perfect pre- 
servation. The first true lower molar is very similar to the 
fourth premolar, ages . Hise broader anteriorly. The second 
Premolar is narrow, with the anterior cusp compressed and sep- 
arated from the ee tubercle by a wide notch. The lower 
teeth resemble those of Lophiotherium Se seo Leidy, as well 
4s those of the smaller species, L. Ballard’ Marsh, and both 
me ne senna doubtless be placed in the genus Orotherium. 
elations ne this genus to Orehippus cannot at present be 
ily determine 
Measurements. 
Lon ngitudinal extent of last six lower teeth,...........++- 47) 9 
Extent of last three lower molars,.......-+2++++0+ Ree & 3 
Tateto-posterior diameter of last ‘lower MOIGL,» oss oben ue 11°5 
Wiaverie distaste; ccc. acs occ os fv tonnes oe 5° 
Antero-posterior diameter of fourth lower premolar, cevinde s 
MSVerse diameter, .....ssc-seccre sees ceerreees seeed 
This specimen was found near Henry’s Fork, Wyoming, by 
the writer, in September last. 
