348 Bulletin American Museian of Natural History. [\''ol. XXVII, 



elephant constitute so many suborders of the order " Chelophora," which 

 forms the first sublegion " Zonoplacentalia," of the legion "Deciduata." 

 It will be noted that the main criteria of classification are the modes of 

 placentation. 



1868. Owen.^ 



Ungulata. 



Order Artiodactyla. 



Suborder Ruminantia. Family names listed: Bovidae, Moschi- 



dae (including Tragulus, Moschus), 

 Cervidae, Camelidae. 

 Suborder Omnivora. Merycopotamus, Dichodon, Xiphodon, 



Anoplotherium, Micro therium, Entelo- 

 don, Hippopotamus, etc., Suidae. 

 Order Perissodactyla. Coryphodon, Pliolophus, Hyracotherium, Lo- 



phiodon, Palaeotherium, Paloplothe- 

 rium, Macrauchenia, Elasmotherium, 

 Rhinoceros, etc., Hyrax, Anchitherium, 

 Hipparion, Equidae, Tapirus, Toxodon, 

 Nesodon. 



This classification is actually inferior to that of de Blainville of thirty- 

 four years earlier date (1834). 

 1864 to 1872. Huxley.' 



Ungulata. 



Order Perissodactyla. 



Families Equidse, Rhinocerotidse, Tapiridse, Palseotheridae, Mac- 

 rauchenidjE. 

 Order Artiodactyla. 



Non-Ruminantia. Families Suida^, Hippopotamidse, Anoplo- 



theridse. 

 Ruminantia Divisions Tragulidae, Cotylophora (Cervidse, Bovi- 

 da?, Giraffidse, Antilocapridse), Camelidse. 

 Order Toxodontia. 

 " Proboscidea. 

 '" Hyracoidea. 



Note : (1 ) the close association of the families listed under "Cotylophora " 

 and the emphasis upon placental characters implied in this term. (2) The 

 separation of the orders Hyracoidea Huxley, Toxodontia Owen. Huxley 

 (1872, p. 292) doubted the naturalness of the group Ungulata, saying that 

 "it may be open to question whether the group thus named represents a 

 single order, or more than one." 



1 Zool. Index to his Comp. Anat., Vol. Ill, pp. 839 et seq.). 



2 Medical Times and Gazette, 1864. 



