< 87 



Perissodactyli? incertae sedis. 



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



incisors wanting. 



ELASMOTHERIIDAE. (LIV.> 



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 CliTl$to\=Hippotherium Kaup. 



Merychippus Leidy. 



Protophippus Leidy=Hippidion Owen 1870. 



XLVII. ANCHITHERIIDAE. 



Extinct. 

 Genera fide Leidy. 



Anchitherium v. WLeyer=Hipparitherium Christol. 

 Hypohippus Leidy, 1858. 

 Paraliippns Leidy, 1858. 

 Anckippus Leidy, 1868. 



SUPER-FAMILY RHINOCEROTOIDEA. 



XLVIII. RHINOCEROTIDAE. 



Genera. 

 Rhinaster Gray. 



Jthinaster sensu strict. Ceratotherhim Gray, 



Rhinoceros Linn. 



Rhinoceros sensu strict. Ceratorhinus Gray. 



Extinct. 



. 1. 

 Coelodonta Bronn. 



. 2, 



Accrothirium Kaup. 

 Bad aether ium Croizet. 

 Hyracodon Leidy. 



