76 



2. True molars of upper jaw with quadrate crowns, with four principal 

 pyramidal and more or less distinctly trihedral lobes, divided by deep 

 valleys, not filled up by cement, but, in some genera, interrupted with 

 minor tubercles and ridges. (Owen.) Orbits, attypically, with a 

 continuous margin behind. Lower jaw, attypically, with a tubercle 



projecting outwards. (Anthracotheroidea.) 



ANTHRACOTHERIIDAE. 



ARTIODACTYLI1 INCERTAE SEDIS. 



SUPER-FAMILY CHALICOTHEROIDEA. 



XXVIIIa. CHALICOTHERIIDAE. 



Chalicotherium Kaup., Falc. 



PECORA. 

 STTPER-FAMILY CAMELOIDEA, 



XXVIII. CAMELIDAE. 

 Genera. 



(XLV.) 



Camehis Linn. 

 Auchenia 111. 



Merycotlierium Bojanus. 

 Poebrotherium Leidy. 

 Procamelns Leidy. 

 Megalomeryx Leidy. 

 Homocamelus Leidy. 

 Protomeryx Leidy. 

 Merycodiis Leidy. 

 Camelops Leidy. 

 Palauchenia Owen. 



Extinct Camelidae. 



Giraffa Storr ex. 



SUPER-FAMILY GIRAFFOIDEA. 



XXIX. CIRAFFIDAE. 



Single genus. 

 s$. = Camehparclalis Cuv. 



SUPER-FAMILY BOOIDEA. 



XXX. SAIGIIDAE. 



Genus. 

 Saiga Gray. 



XXXI. BOVIDIAE. 



SUB-FAMILIES. 



(Fide auct. plur.) 



I. Form massive, with the head declined ; with the neck abbreviated, the 

 third and succeeding vertebrae being much shortened. Legs stout, and 



