ZOO-GEOGRAPHICAL REGIONS 907 



between Western Holarctic and Neotropical, and (3) the 

 Austro-Malaysian Islands lying to the east of Bali and 

 Borneo, inclusive of the Solomon Islands, a region inter- 

 mediate between Oriental, Australian, and Polynesian. It 

 seems also convenient to recognise two Polar regions — 

 Arctic and Antarctic. 



It may be useful to map out the divisions as follows : — 



ARCTIC 

 Nearctic. Pal.earctic. 



I Holarctic. | 



Transition Transition 



to to — Oriental. 



I 



Transition to Polynesian 



and to 



Polynesian — Neotropical. Ethiopian. Australian. 



ANTARCTIC 



Many authorities use the following arrangement : — 



NoTOG^A OR Southern World 



I. Australian Region, including three sub-regions — New Zealand, 



Australian, and Papuasian or Austro-Malayan. 

 II. Neotropical Region, including two sub-regions — South American 

 and Antillean or West Indian. 



Arctog^a or Northern World 



III. Periarctic or Holarctic Region, including two sub-regions — 



Palrearctic (Eurasian and Mediterranean) and Nearctic 



(Canadian and Sonoran). 

 IV. Palaeotropical Region, including two sub-regions — African 



(Ethiopian and Malagasy) and Oriental (Indian and 



Malayan). 



