466 Bulletin American Museum of Natural History. [Vol. XXVII, 



Siiperorder Paraxonia Marsh. 



Order Artiodactyla Owen (ex Blainv.). 



Suborder Non-ruminantia (auct.). Fam. Trigo- 

 nolestida?, Dichobunidse, Anthracotheriida?, 

 Hippopotamidse; Achaenodontidae, Entelodon- 

 tidfe; Dicotylidse, Suidtie. 

 Suborder Rurainantia (auct.). Fam. Camelidse, 

 Oreodontidte, Anoplotheriidse, Hypertragulidse, 

 Tragulidae, Cervidte, Merycodontidie, Antilo- 

 capridie, Giraffidfe, Bovida?. 

 Superorder Ungvdata (Linn.). 

 Order Protungulata (auct.). 



Suborder Taligrada (Cope) Osb. Fam. Perip- 



tychidfe, Pantolambdidae. 

 Suborder Condylarthra (Cope). Fam. Menis- 

 cotherii(he, Phenacodontidae. 

 Order Amblyj)oda Cope. Fam. Coryphodontidae, 



Uintatheriidic. 

 Order Barytheria Andrews. 

 Order Sirenia Illiger. 

 Order Proboscidea Illiger. 

 Ortler Hyraces Wagler. 

 Order Embrithopoda Andrews. 

 Order Notoungulata (Roth) Scott. 



Suborder Homalodotheria (Scott). Fam. 

 ? Notostylopida?, ?Henricosbornidae, Homalo- 

 dotheriidae. 

 Suborder Astrapotheria. Fam. ?Albertogaudry- 



idae, ?Isotemnid;e, Astrapotheriidae. 

 Suborder Toxodontia Owen. Fam. Nesodonti- 

 dse, Toxodontidae, Archaeohyracidae, Protypo- 

 theriidae, Interatheriidse, Typotheriidae. 

 ? Suborder Pyrotheria. Fam. Pyrotheriidae. 

 Suborder Litopterna (Ameghino). Fam. Pro- 

 terotheriidae, Macraucheriidae. 

 Order Mesaxonia (Marsh). 



Suborder Perissodactyla Owen. 

 Suborder Ancylopoda Cope. 

 Superorder Cetacea Linn. 



Order Zeuglodontia Gill (Archaeoceti Zittel). 

 Order Odontoceti (Gray). 

 Order Mystacoceti (Gray). 



