1910.] Taxonomic History of the UiH/nhito. ,351 



This classification was on the whole not only the best up to that date but 

 also far more natural than several later ones. With some emendations it 

 has been very widely accepted. It is evidently founded on practical know- 

 ledge and discriminating judgment. It erred chiefly in including the 

 Macraucheniidse and Proterotheriid;e in the suborder Perissodactyla. 



1891, 1898. Cope. 



Order Ancylopoda (under Unguiculata). Fain. Chalicotheriidse. 

 Ungulata. 



Order Taxeopoda. 



Suborder. Condylarthra. Fam. Periptychidie, PhenacodontitU'P, 

 Meniscotheriidae. 

 Litopterna. Fam. PioterotheriidjB, Macraucheniidce, 



Astrapotlieiiida'. 

 Hyracoidea. Hyracidae. 

 Daubentonioidea. Fam. Chiiomyidse, (Mixodectidte 



[1898]). 

 Quadrumana. Fam. Mixodectidte [1891], Adapidse, 

 Anaptomorphidce, Tarsiida^, Lemuridce, Hapalidse, 

 Cebidi3e, Cercopithecidse. 

 Anthropomorpha. Fam. Simiidae, Hominidse. 

 Order Toxodontia. (Typotherfa [1898]): Fam. Atryptheriidae, Inter- 

 atheriidse, Protoxodontidse, Nesotheriidse, Xoto- 

 dontidse, Toxodontidse. 

 Order Proboscidea. Fam. Dinotheriidse, Elephantidae. 

 Order Amblypoda. 



Suborder Taligrada. Fam. Pantolambdidse. 



Pantodonta. Fam. Coryphodontidae. 

 Dinocerata. Fam. Uintatheriidse. 

 Order Diplarthra. 



Suborder Perissodactyla. Fam. Lophiodontidse, Triplopidse, Cse- 

 nopidse, Hyracodontidse, Rhinoceridse, Tapiridse, 

 Lambdotheriidse, Menodontidae [Brontotheriidae], 

 Palseotheriidse, Equidae. 

 Suborder Artiodactyla. Fam. Pantolestidae [Trigonolestidae], Eu- 

 rytheriidae, Anoplotheriidae, Dichobunidae, Caeno- 

 theriidae, Anthracotheriidae, Xiphodontidae, Suidae, 

 Hippopotamitlae, Merycopotamidae, Dichodontidae, 

 Oreodontidae, Poebrotheriidae, Pro tola bid idae, Ca- 

 melidae, Eschatiidae, Tragulidae. Moschidae, Bovidse, 

 Cervidae. 



Cope's classification appears to be in a considerable degree unnatural 

 and founded upon supposed principles of the evolution of the carpus and 

 tarsus which subsequent research has largely discredited (p. 452). 



The order Ancylopoda, instead of being independently derived from an 

 unguiculate stock, as maintained by Cope, is almost certainly a division of 

 the Perissodactyla (see p. 400). 



