518 THE AGE OF MAMMALS 



SuHFAM. Macropodinse. Kangaroos and Wallabies. 



Dorcopsis. Mailer's Kangaroo. New Gain. 



DendroUtgus. Tree Kangaroo. New Gain., Aastral. 



Luf/orchentes. Hare Wallaby. Aastral. 



Onychogale. Spar-tailed Wallaby. Aastral. 



Petrogale. Rock Wallaby. Aastial. 



Mncropus. Kangaroo & Wallaby. Austral., New Gain. (Pleist., 

 Austral). 



f Palorchestes. Pleist., Austral. 



■\ Sthenuru.<. Pleist., Austral. 

 Fam. Phascolomyidae. Wombats. 



Pfiascolonii/s. Wombat. Aastral. (from Pleist.). 



f Phascolonus. Pleist., Austral. 

 Fam. Diprotodontidae. Giant, Ground-sloth Marsupials. 



f Nototherium. Notothere. Pleist., Austral. 



f Diprotodon. Giant Diprotodon. Pleist., Aastral. 



11.3. Suborder 'Multitubercul at a ' ( = Allotheria). Multitu- 

 berculates. Archaic Diprotodont Marsupials.^ 



Inc. Sed. t Tritylodon. (?) L. Jur., S. Afr. 



Fam. Plagiaulacidae. Plagiaalacids. 



f Microlestes. U. Trias., Eur. 



f Trifjii/phus. U. Trias., Germany. 



f Plagiaulax. U. Jur., Eur. & N. Amer. 



t Bolodon. U. Jur., N. Amer. 



f Allodon. U. Jur., N. Amer. 



f Clenacodon. U. Jur., Eur. & N. Amer. 



I PtUodmt (incl. Ckirox). U. Cret. & Bas. Eoc, N. Amer. 



f Neoplagiaulax. Bas. Eoc, Eur. & N. Amer. 



f Meniscoessus. U. Cret., N. Amer. 



f Poiijmaslodon. Bas. Eoc, N. Amer. 



BB. Infraclass M O N O D E L P II I A. Placentals. 



a. Cohort UNGUICULATA. Clawed Mammals. 



1 Vide Osborn, H F., The Structure and Classification of tlie Mesozoic Mammalia. Journ. 

 Acad. Nat. Set., Phila., Vol. IX, 1888, pp. 186-265. 



For a brief review see Osborn, H. F., Evolution of Mammalian Molar Teeth, 1!K)7, pp. 101- 

 106. Gidley has recently shown that the skull of Ptilodus is of the marsupial type. 



A number of extinct Pataj;onian forms (e.g. Propobnaa.'itodon, Polydolops) which are 

 referred to this order by Ameghino may possibly prove to represent highly specialized 

 Cajnolestoids. (W. K. G.) 



