87 



Perissodactyli? incertae sedis. 



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

 incisors wanting. 



ELASMOTHEBIIDAE. (LIV.; 



% SUPER-FAMILY ANCHIPPODONTOIDEA. 



XLVa. ANCHIPPODONTIDAE. 



Extinct. 

 Anchippodus Leidy =7ro^osu* Leidy. 



SUPER-FAMILY SOLIDUNGULA. 

 XLVI. EQUIDAE. 



Genera. 

 Equus Linn. 

 Asinus Gray. 

 Asinus sensu strict. Hippotigrii H. Smith. 



Extinct. 



Hipparion C1arisio\=Hippotherium Kaup. 

 Merychippus Leidy. 

 Protophippus Leidy=H!ppidion Owen 1870. 



XLVII. ANCHITHERIIDAE. 



Extinct. 

 Genera fide Leidy. 



Anchitherium v. N[eyer=Hipparitherium Christol. 

 Hypohippus Leidy, 1858. 

 Parahippus Leidy, 1858. 

 Anchippus Leidy, 1868. 



SUPER-FAMILY RHINOCEROTOIDEA. 

 XLVIII. RHINOCEROTIDAE. 



Genera. 

 Rhinaster Gray. 



Rhinaster sensu strict. Ceratotherium Gray. 



Rhinoceros Linn. 



Rhinoceros sensu strict. Ceratorhinus Gray. 



i 



Extinct. 



.1. 

 Coelodonta Bronn. 



.2. 



Acerothirium Kaup. 

 Badactherium Croizet. 

 Byracodon Leidy. 



