CLASSIFICATION OF VERTEBRATA 



40 



2. Sub-CLASS METATHERIA, Huxley, s. Mar- 

 supialia, Illiger, s. Didelphia, de Blainville 



Viviparous, with marsupium; without chorion; with epi- 

 Dubic or marsupial bones. 



Coracoids reduced, not reaching the sternum. 



Males at least without cloaca. 



1. Order Polyprotodontia, Owen. Dentition complete; 

 lower jaw with three or four pairs of incisors. Carnivorous ; 

 without caecum. Since the Triassic epoch. l '^^ 



1. Sub -order ?PROTODONTA, Osborn. Dromatherium. 

 Fpper Trias, Carolina. 



2. Sub-order ?TRICONODONTA, Osborn. Amphiles tes 

 id Phascolotherium, Oolite ; Tricono don, upper Jurassic, 

 igland. 



3. Sub-order TRITUBERCULATA, Cope. 

 Amphitheriidae. Jurassic, Cretaceous, England. 

 Amblotheriidae. Amblotherium and Dryolestes. Jurassic 



md Cretaceous of North America. 



Myrmecobiidae. Myrmecobius fasciatus. "West Australia. 

 Peramdidae. Perameles, Chaeropus. Australia. 

 Dasyuridae. Dasyurus, Thylacinus. Australia, since the 

 ^istocene. 



Doubtful relatives in Tertiary, Patagonia. 

 Notorydidae. Notoryctes typhlops. Central Australia. 

 Didelphyidae. Since the Eocene in America and Europe. 

 Recent : 

 Didglphys. N". and S. America. 

 Chirojiectes. S. America, Chile. 

 2. Order Diprotodontia, Owen. Lower jaw with one pair 

 )f incisors. 



Canines weak or absent. Herbivorous, with caecum. 

 Since the Mid-Tertiary epoch in South America ; since the 

 ^istocene in Australia. 



Epanorthidae., Epanorthus. Mid-Tertiary, Patagonia. 



Caenolestes. Ecuador and Columbia. 

 Phalangistidae. Phalangista, Petaurus, Phascolarctos, in 

 aistralia and Papuasia. 



J* 



