OF THE MESOZOIC MAMMALIA. 
J87 
ENGLAND. 
NOKTH AMERICA. 
GERMANY 
AND 
FRANCE. 
AFRICA 
AND 
AUSTRALIA. 
Quaternary. 
Australian Bone 
Caves. 
Thylacoleo. 
Eocene. 
Lowermost Eocene, 
Puerco. 
Polymastodon, 
Ptilodus, 
Chirox, 
Neoplayiaulax. 
Lower Eocene, 
Cernaysienne. 
Neoplagiaulax. 
Cretaceous. 
Uppermost Cretace- 
ous, Laramie. 
Meniseoessus, 
Jurassic. 
Upper Jurassic, 
M iddle Purbeck Beds. 
Spain coiherium, . . 
Amblotherium, 
Achyrodon, 
Phnscolfsleg, . . . 
A throdon, 
Stylodon, .... 
Peraleateg, 
Ptragpalax, 
Lfiplocladus, 
Trieonodon, . . . 
Triacanthodon, 
Plagiaukix, . . . 
Bolodon, 
Peramug, 
Lower Jurassic, 
Stonesfield Slate. 
Aniphitherium, 
Amphilestes, 
Phascoloihemim, . . 
Slereognaihus, 
Amphitylug. 
Upper Jurassic, 
Atlantosaurus Beds. 
Paurodon, 
Menacodon, 
Diplocynodon, 
Docodon, 
Dryolestes, 
Stylacodon, 
Priacodon. 
Asthenodon, 
Laodon, 
Trieonodon, 
Enneodon, 
Ctenacodon, 
Alio don, 
Tinodon. 
(Tinodon.) 
Triassic. 
Uppermost Triassic 
or Rhaetic. 
Microlesies. 
Uppermost Triassic 
or Jura Trias. 
Dromatherium, 
Microconodon. 
Uppermost Triassic 
or Rhaetic. 
Microlesies, 
Triglyphus, .... 
Upper Triassic, 
Stormberg Beds, 
S. Africa. 
Tritylodon. 
N. B. — The genera in adjoining columns and connected by dotted lines are closely related to each other. 
Professor Cope now considers the Puerco as uppermost Cretaceous. Judging by the degrees of specialization 
observed in the related American and British genera, the American Upper Jurassic beds are slightly older 
than the Purbeck 
