260 FISHES. 



III. The Equatorial Zone. 



A. The Tropical Atlantic. 



B. The Tropical Indo-Paoific. 



C. The Pacific Coast of Tropical America. 



1. The Central American district. 



2. The Galapagoes district. 



3. The Peruvian district. 



IV. The Southern Temperate Zone. 



1. The Cape of Good Hope district. 



2. The South Australian district. 



3. The Chilian district. 



i. The Patagonian district. 



V. The Antarctic Ocean. 



As with freshwater fishes, the main divisions of the Shore- 

 fish faunae are determined by their distance from the equator, 

 the equatorial zone of the Freshwater series corresponding 

 entirely to that of the Shore-fish series. But as Marine fishes 

 extend farther towards the Poles than Freshwater fishes, and 

 as the polar types are more specialised, a distinct Arctic and 

 Antarctic fauna may be separated from the faunae of the 

 temperate zones. The two subdivisions of the Northern 

 temperate zone in the Freshwater series are quite analogous 

 to the corresponding divisions in the Coast series. In the 

 Southern Hemisphere the Shore-fishes of the extremity of 

 Africa form a separate district of the temperate zone, whilst 

 the Freshwater fishes of South Africa were found to be 

 tropical types. The Marine series of the Southern temperate 

 zone is also much more diversified than the Freshwater series, 

 and admits of further subdivision, which, although in some 

 degree indicated in the Freshwater series, does not entirely 

 correspond to that proposed for the latter. 



