114 



THE AMEBIC AN NATURALIST [Vol. XLII 



2. Migration, perhaps of North American Origin, of 

 the Chalicotheriidae (Pernatherium). 



VII. Ludian stage, two successive faunae: 



(a) Lower Ludian (deposits of Saint Hippolyte de 

 Caton (Gard), of Hordwell (Isle of Wight), lower strata 

 of the Gypse de Paris ; part of the Quercy phosphorites. 



1. Local Evolution.— Continuance of Palaeotheriidae, of 

 Hyracotheriidae (last of Lophiotherium),of Anchilophidae, 

 of Suidse ( Choeropotamus, Cebochoerus), of Dacrytheridae 

 (Dacrytherium), of Xiphodontidae (Amphimeryx), of 

 Dichodontida? (last of Dichodon), of Anthracotheriidae 

 (Catodontherium), of Hyaenodontidae (Hyaenodon, Quer- 

 cytherium), of mesodont Primates (Adapis) and Anap- 

 tomorphidae ( Microchoerus ) . 



2. No new migration known. 



(b) Upper Ludian (Gypse de Montmartre, deposits of 

 Gargas, of Mornoiron, of Villeneuve la Comptal; of the 

 Bembridge beds and the Headon beds in England; part 

 of the phosphorites. 



1. Local Evolution.— Continuance of Palaeotheriidae, of 

 Anchilophidae (last of Anchilophus), of Xiphodontidae 

 (Amphimeryz, Xiphodon), of Dacrytheridae (last of Da- 

 crytherium), of Anthracotheriidae (first representatives 

 of Brachyodus, earliest Anthracotherium), of Suidae (last 

 of Acotherulum, Choeropotamus, and Cebochoerus), of 

 Dichobunidae (last of Dichobune), of Hyaenodontidae (Hyae- 

 nodon, Pterodon), of Sciuridae (Plesiarctomys, Sciurus), 

 of Adapidae (last of Adapis), of the Lemuroidea (last 

 of Necrolemur). 



2. Migrations of Unknown Origin of the Anoplotheridae 

 (Anoplotherium), of the Caenotheridae (Oxacron = Hyce- 

 gulus), of the Canidae (Cynodictis), of the Rodentia-The- 

 ridomyidaD (Theridomys), and Myoxida 4 (Myoxus). 



3. Americ<ni Migration of the Marsupial Didelphyida 4 

 (Peratherium). 



(To be continued.) 



