87 
Perissodactyli2 incertae sedis. 
Molar teeth of lower jaw with a crenulated longitudinal ridge. Canines and 
incisors wanting. 
ELASMOTHERIIDAE. 
SUPER-FAMILY ANCHIPPODONTOIDEA. 
XLV a. ANCHIPPODONTIDAE. 
Extinct. 
Anchippodus Leidy==Trogosus Leidy. 
SUPER-FAMILY SOLIDUNGULA. 
XLVI. EQUIDAE. 
Genera. 
Equus Linn. 
Asinus Gray. 
Asinus sensu strict. Hippotigris H. Smith. 
Extinct. 
Hipparion Christol=Hippotherium Kaup. 
Merychippus Leidy. 
Protophippus Leidy=Hippidion Owen 1870. 
XLVII. ANCHITHERIIDAE. 
Extinct. 
Genera fide Leidy. 
Anchitherium v. Meyer=Hipparitherium Christol. 
Hypohippus Leidy, 1858. 
Parahippus Leidy, 1858. 
Anchippus Leidy, 1868. 
SUPER-FAMILY RHINOCEROTOIDEA. 
XLVITII. RHINOCEROTIDAE. 
Genera. 
Rhinaster Gray. 
Rhinaster sensu strict. Ceratotherium Gray. 
Rhinoceros Linn. 
Rhinoceros sensu strict. Ceratorhinus Gray. 
’ 
Extinct. 
Salt 
Coelodonta Bronn. 
$. 2. 
Acerothirium Kaup. 
Badactherium Croizet. 
Hyracodon Leidy. 
(LIV.) 
