Xppendix 515 



Class MAMMALIA, Mammals 



A. Subclass PROTOTHERIA. Egg-laying Mammals. 



I. Ordkr PROTODONTA.i Protodouts (doubtfully placed here). 



■j- Dromatherium.^ U. Trias., N. Amer. 



f Microconodon.^ U. Trias., N. Anier. 



Inc. Sed. f Karoomys. U. Trias., S. Afr. (Possibly a theriodout 

 reptile.) 



II. Order MONOTREMATA. Monotremes. 



Fam. 'Echidnidae ' (= Tachyglossidae). Spiny Anteaters. 



' iscA/r/zia ' (= Tachyglossus). Echidna. Austral. 



^ Proiichiilna' ( = Zaglossus). Long-snouted J]chidiia. New Guin. 

 Fam. Ornithorhynchidae. Duckbills. 



Ornithor/n/nchits. Duckbill or Platypus. Austral. 



B. Subclass EUTHERIA.^ Viviparous Mammals. 

 AA. Infraclass DIDELPHIA (Metatheria). Marsupials. 



I. Order TRICONODONTA.^ Triconodonts or Mesozoic Carnivorous Mar- 



supials (?). 



^ Amph'destes. M. Jur., England. 



t Phascolotherium. M. Jur., England. 



t Triconodnn. M. & U. Jur., P^ngland & N. Amer. 



t Sfmldcntherium. U. Jur., England. 



II. Order MARSUPIALIA.* Marsupials or Pouched Mammals. 



II. 1. Suborder Polyprotodontia. Chiefly Insectivorous and Car- 

 nivorous Marsupials and their Allies. 



Inc. Sed. f Pedioinijs. U. Cret., N. Amer. 



Inc. Sed. f DidelpJiops. U. Cret., N. Amer. 



Inc. Sed. f Carolonmefjhinia. Eoc, S. Amer. 



SuPERFAM. DiDhLPiioiDEA. Dldelphoids. 



Fam. Didelphiidae. Opossums. 



t Proteodidelphys. L. Eoc, S. Amer. 



1 Vide Osborn, Evolution of Mammalian Molar Teeth, 1007, pp. 18-21. 



2 Gill in IStl used this term to embrace both Marsupialia and Phu-entalia. Huxley used it 

 to designate the hypothetical ancestors of the Placeiitals. Gill's usage is here followed. 



3 See Osboi-n, Evolution of Mammalian Molar Teeth, litOT, pp. 21-30, figs. A-35. 



* For a general review of the inter-relationships of the niarsupial families, see Bensley. B. A., 

 On the Evolution of the Australian Marsupials, with Remarks on the Relationships of the Mar- 

 supials in General. Trans. Lhui. Soc, London, ser. 2, Zoill. Vol. IX, Pt. 3, Dec, 1903, pp. S.'i- 

 217; and Gregory, W. K., The Orders of Mammals, Bull. Amer. 3/(w. Nat. Hist., Vol. XXVH, 

 1910, pp. 1-524. The present arrangement by Gregory embodies the chief results of many 

 earlier authors (especially de Blainville, Owen) and of DoUo, Bensley, Ameghiuo, Sinclair, and 

 others. 



