No. 495] EVOLUTION OF TERTIARY MAMMALS 167 



2. No new migration is known. 



This fauna seems to be simply ;\ much-reduced remnant 

 of the Ludian fauna and should be more properly included 

 with the upper Eocene. 



(b) Fauna of the limestone of Brie, of Hempstead 

 (Isle of Wight), of Ronzon (Velay),of Lobsann (Alsace), 

 of Calaf and Tarrega (Catalonia). A part of the phos- 

 phorites of Quercy and of the "terrain siderolithique" 

 (Bohnerz) of Veringendorf, Veringenstadt, of the Esels- 

 berg, of the Hochberg and of Oerlingerthal near Ulm, 

 belong to the same horizon. Possibly the beds of Monte- 

 Promina (Dalmatia) belong to this horizon or to the pre- 

 ceding one. 



1. Local Evolution.— Continuance of the Palaeotheriidae 

 (Palaeotherium, Plagiolophus), of Anthracotheriidae (con- 

 tinuance of Brachyodus, and appearance of species of 

 Ancodus, some species of Anthracothervum), end of the 

 Anoplotheriidre (last Diplobune), continuance of Ca?nothe- 

 riidag (Amphimeryx, M ':rnotherium),of Canida? (Cynodon, 

 Cynodictis, Amphicynodon ) , of ErinaceidaB (Tetracus), 

 of Theridomyidae (Theridomys), of Hysenodontidae (HyaB- 

 nodon), of the Marsupial Didelphyidn? (Peratherinm 

 Amphiperatherium) . 



2. Important North American migrations: Sudden ap- 

 pearance of the Rhinocerotidas (Ronzotherium), and of 

 the Entelodontidas (Entelodon). 



3. Migrations of unknown origin of the Tragulidae 

 (Gelocus), of MustelidaB (Proplesictis), of the Myomorph 

 Rodentia (Cricetidae), and perhaps of the Amphicyoninae 

 (beds of Tarrega). 



II. Middle Oligocene {Stampian or Upper Tongrian), 

 very numerous deposits: in the Paris basin, la Ferte- 

 Aleps; in Germany, Ufhofen, Flonheim, Miesbach, lig- 

 nites of Schluchtern, of Gusternheim and of Westerwald ; 

 in the basin of TAllier, Bournoncle-Saint-Pierre, Bons, 

 Perrier, Montaigut-le-Blanc, Champeix, Autrac, Saint- 

 Germain-Lembron, Antoingt, Vodable, Solignat, Lamont- 



