ZOO-GEOGRAPHICAL REGIONS. 805 



Solomon Islands, a region intermediate 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. 



Holarctic. 



Transition Transition 



to to ORIENTAL. 



I 



Transition to Polynesian 



'and to 

 Polynesian NEOTROPICAL. ETHIOPIAN. AUSTRALIAN. 



(Antarctic.) 



Many authorities use the following arrangement : 



NOTOG.EA 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, 



Palaearctic (Eurasian and Mediterranean) and Nearctic (Cana- 

 dian and Sonoran). 



IV. Palceotropical Region, including two sub - regions, African 



(Ethiopian and Malagasy) and Oriental (Indian and Malayan). 



