78 GEOGRAPHICAL DISTRIBUTION OF ANIMALS. 



" 6. The Neotropical., corresponding to the continent of 

 South America, with Central America, the West Indies, and 

 the greater portion of Mexico." 



Professor Heilprin makes several modifications on this 

 scheme of distribution : {a) uniting Palsearctic and Nearctic 

 in one Holarctic realm ; (b) establishing a special Polynesian 

 realm for the scattered island groups of the Pacific ; and (c) 

 defining three transition regions, (i) around the Mediterr- 

 anean, intermediate between East Holarctic, Ethiopian, 

 and Oriental, (2) Lower California between Western Hol- 

 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 may be convenient to map out the divisions as 

 follows : — 



(Arctic. ) 

 Nearctic. Pal^arctic. 



I Holarctic. | | 



Transition Transition 



to to Oriental. 



.1. 

 Transition to Polynesian 

 and to 

 Polynesian — Neotropical. Ethiopian. Australian. 



(Antarctic. ) 



