17<) 



THE AMERICAN NATURALIST [Vol. XLII 



rium), of Chalicotheriidae (Macrotherium), of Anthraco- 

 theriidae (Brachyodus, last of Anthracotherium), of Suidae 

 (Palaeochcerus, ! Doliochcerus), of CaenotheriidaB (Caeno- 

 therium, Plesiomeryx), of Cervulinae (last Dremotherium 

 and Amphitragulus), of Theridomyidae ( Theridomys ) , of 

 Myoxidae (Myoxus), of Eomyidae (Rhodanomys), of 

 Sciuridae (Sciurus), of Castoridae (Steneofiber), of Lago- 

 morph Rodentia (Titanomys), of Talpidae (Talpa), of 

 Soricidaa (Sorex), of Erinaceidae (Palaeoerinaceus, Eri- 

 naceus), of CanidaB (Amphicynodon, Cephalogale), of 

 Amphicyoninae (Amphicyon), of Mustelidae (Stenogale, 

 Plesictis, Palaeogale), of Lutrinae (Potamotherium), of 

 Viverridae (Amphictis, Herpestes), of Felidae (Proaelu- 

 rus), of Marsupialia (the last European Didelphyidae). 



2. Smaller migrations of unknown origin of the Dimy- 

 lidae (Dimylus, Cordylodon). 



The Aquitanian fauna is chiefly an impoverished resi- 

 due of the Stampian. 



Important migrations begin again with the Miocene 

 epoch, and these will form the subject of a later paper. 



