87 



Perissodactyli? incertae sedis. 

 Molar teeth of lower jaw with a crenulated longitudinal ridge. Canines and 



incisors wanting. 



ELASMOTHERIIDAE. (LIV.j 



SUPER-FAMILY ANCHIPPODONTOIDEA. 

 XLV a. ANCHIPPODONTIDAE. 



Extinct. 

 Anchippodus Leidy=Trogosus Leidy. 



SUPER-FAMILY SOLIDUNGULA. 

 XLVI. EQUIDAE. 



Genera. 



Equus Linn. 

 Asinus Gray. 



Asinus sensu strict. Eippotigris H. Smith. 



Extinct. 

 Hipparion Christo\=Hippotheriu7n Kaup. 

 Merychippus Leidy. 

 Protophippus Leidy=Hippidion Owen 1870. 



XLVII. ANCHITHERIIDAE. 



Extinct. 

 Genera fide Leidy. 



Anchitherinm v. Meyer= Hipparitherium Christol. 

 Hypohippus Leidy, 1858. 

 Purahippus Leidy, 1858. 

 Anchippus Leidy, 186S. 



SUPER-FAMILY RHINOCEROTOIDEA. 

 XLVIII. RHINOCEROTIDAE. 



Genera. 



Rhinaster Gray. 



Rhinaster sensu strict. Ceralotherium Gray. 



Rhinoceros Linn. 



Rhinoceros sensu strict. Ceratorhinus Gray. 



Extinct. 

 §. 1. 



Coelodonta Bronn. 



Acerothirium Kaup. 

 Badactherium Croizet. 

 Ilyracod'jn Leidy. 



§.2. 



