128 



DYNAMICAL GEOLOGY. 



Primary Regions and Provinces. Taking all the 

 causes into account, the whole land-surface has heen 

 divided by Mr. Wallace into six faunal regions viz. : 



FIG. 69. 



1. Nearctic, including all North America exclusive of Cen- 

 tral America. 2. Neotropic, including Central and South 

 America. 3. Palwarctic, including Europe, Africa north 

 of the Sahara, and Asia north of the Himalayas. 4. Afri- 

 can, including Africa south of the Sahara and Madagascar. 

 5. Oriental, including Asia south of the Himalayas and 

 all the adjacent islands. 6. Australian, including Aus- 

 tralia, New Zealand, New Guinea, and the South Sea 

 Islands. 



These primary regions are subdivided into provinces, 

 and these into sub-provinces, according to the principles 

 already explained. We will illustrate by only one example. 

 The Nearctic region is divided into four provinces : 1. 



