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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. (XLV.) 



ARTIODACTYLH INCERTAE SEDIS. 

 SUPER-FAMILY CHALICOTHEROIDEA. 



XXVIIIa. CHALICOTHERIIDAE. 

 Chalicotherium Kaup., Falc. 



PECORA. 



SUPER-FAMILY CAMELOIDEA. 



XXVIII. CAMELIDAE. 



Genera. 



Camelus Linn. 

 Auchenia III. 



Merycotherium Bojanus. 

 Poebrotherium Leidy. 

 Procamelus Leidy. 

 Megalomeryx Leidy. 

 Homocamelus Leidy. 

 Protomeryx Leidy. 

 Merycodus Leidy. 

 Camelops Leidy. 

 Palaiichenia Owen. 



Extinct Camelidae. 



Giraffa Storr ex. 



Saiga Gray. 



SUPER-FAMILY GIRAFFOIDEA. 

 XXIX. GIRAFFIDAE. 



Single genus. 

 .= Camelopardalis Cuv. 



SUPER-FAMILY BOOIDEA, 

 XXX. SAIGIIDAE. 



Genus. 



XXXI. BOVIDIAE. 



SUB-FAMILIES. 

 (Fide aucl. plur.) 



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

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



