252 O. C. Marsh—New Vertebrate Fossils. 
in Acerotherium and many other members of the Rhinoceros 
family, are really canines. 
The nasals in this genus are smooth, and evidently were 
without horns. There were four toes in front and three be- 
hind. The type species is Amynodon_advenus Marsh, which was 
provisionally referred to the genus Diceratheriwm when first 
described. 
Tapiravus rarus, gen. et sp. nov. 
genus, which may be calle ; 
validus Marsh, (Lophiodon validus) from the Miocene of New 
Jersey. This genus may readily be distinguished from Lophio- 
don or Hyrachyus, by the last upper premolar, which is similar 
to the adjoining molars. 
second species of this genus occurs in the Lower Pliocene 
east of the Rocky Mountains, and remains were collected there 
by the writer in 1873. The most characteristic specimen ob- 
tained was an upper molar tooth which indicated an animal 
considerabiy smaller than the living Tapir. The crown of this 
molar was 15™™” in antero-posterior diameter, and 17™™ in trans- 
verse diameter. It is peculiar in having the antero-exterior 
angle very obtuse, and less prominent than the outer cusps. 
Bison ferox, sp. nov. 
This genus has not hitherto been found in the Tertiary of 
ras 
low as the genus has been found in the Old World. This 
specimen indicates an animal much larger than the existing 
Bison, and having very powerful horns. The specimen pre- 
served was over 500™ in length, when complete. The radius 
of the inner curve measures about 400™. The largest end 
has a diameter can and the smaller, at a distance of 
A second larger species, with more curved horns, is indicated 
by a nearly perfect horn-core from the lower Pliocene of 
Kansas. This species, which may be called Bison Alleni, 1m 
honor of Dr. J. A. Allen, of Cambridge, also had very large 
