806 GEOGRAPHICAL DISTRIBUTION OF ANIMALS. 
arctic and Neotropical, and (3) the Austro-Malaysian Islands 
lying to the east of Bali and Borneo, inclusive of the 
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. PALAARCTIC. 
aes wt 
| Holarctic. | 
Transition Transition 
to: to—ORIENTAL. 
Transition to Polynesian 
and to 
Polynesian—NEOTROPICAL. ETHIOPIAN. AUSTRALIAN. 
ANTARCTIC 
Many authorities use the following arrangement :— 
NotToG#a OR SOUTHERN WORLD 
1. Australian Region, including three sub-regions,—New Zealand, 
Australian, and Papuasian or Austro-Malayan. 
u1. Neotropical Region, including two sub-regions, —South American 
and Antillean or West Indian. 
ARCTOGA OR NORTHERN WORLD 
1. Periarctic or Holarctic Region, including two sub-regions,— 
Palearctic (Eurasian and Mediterranean) and Nearctic 
(Canadian and Sonoran). 
. Paleotropical Region, including two sub-regions,— African 
(Ethiopian and Malagasy) and Oriental (Indian and 
Malayan). 
1 
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