362 LAND MAMMALS IN THE WESTERN HEMISPHERE 



Suborder C. TYLOPODA. Camels and Llamas 



IX. Camelid^. 



^ Protylopus, up. Eoc. \Eotylopus, low. Oligo. ^ Poebrotherium, 

 Oligo. '\ Pseudolabis, low. Oligo. ^Protomeryx, up. Oligo. and 

 low. Mioc. ^Oxydactylus, low. Mioc. ^Miolahis, mid. Mioc. 

 \Protolahis, mid. and up. Mioc. '\Alticamelus, mid. Mioc. to 

 low. Plioc. '\Stenomylus, low. Mioc. ^Procamelus, up. Mioc. 

 and low. Plioc. ^ Pliauchenia, up. Mioc. to mid. Plioc. Camelus, 

 Pleist. Lama, Plioc. to Recent, S. A. 



X. fHYPERTRAGULID^. 



^Leptotragulus, up. Eoc. ] Leptoreodon, up. Eoc. ^Leptomeryx, 

 low. Oligo. ^ Hypertragulus, Oligo. \Hypisodus, low. Oligo. 

 "f Protoceras, low. Oligo. \Syndyoceras, low. Mioc. 



Suborder D. PECORA. True Ruminants 



XI. Cervid.e. Deer. 



\Blastomeryx, low. Mioc. to low. Plioc. Cervus, Pleist. and Rec. 

 Rangifer, Pleist. and Rec. Alee, Pleist. and Rec. 'fCervalces, 

 Pleist. Odocoileus, Pleist. and Rec, N. and S. A. Mazama, 

 Pleist. to Rec, S. A. 

 XII. fMERYCODONTiD.^. jDeer-Antelopes. 



\Merycodus, mid. Mioc. to low. Plioc ^Capromeryx, Pleist. 



XIII. Antilocaprid^. Prong-Bucks. 



Antilocapra, Pleist. and Rec. ? '\Dromomeryx, mid. and up. Mioc. 



XIV. BoviD^. Antelopes, Sheep, Goats, Oxen, etc. 



\Neotragocerns, ^Ilingoceros, '\Sphenophalm, low. Plioc \Preptoceras, 

 \Euceratherium, ]Symhos, Pleist. Ovibos, Pleist. and Rec. Bison, 

 Pleist. and Rec. 



This list of families and genera, portentous as it is, would 

 be greatly increased by the addition of the Old World forms, 

 which outnumber those of the western hemisphere. 



Suborder Suina. Swine-like Animals 



The history of the American types of pig-like forms is, 

 in one sense, very full and complete in that the successive 

 genera may be traced back to the Eocene, but, in another 

 sense, the story is exasperatingly imperfect, because so much of 

 the material is fragmentary. Of most of the genera, nothing 

 is known but teeth and jaws, and these, though sufficient for 



