1472 CRUSTACEA. 



Fuegia to the Subfrigid. Van Diemens Land, exclusive of its northern 

 shores, is within the Cold Temperate. 



Indian Ocean Regions. — The Torrid Kegion covers the larger part 

 of the Indian Ocean, including all north of the equator, and embraces 

 the larger part of Madagascar. The Subtorrid extends just beyond 

 Port Natal on the African coast (four degrees of latitude north of Cape 

 Town), where there are coral-reefs. The Warm Temperate and Tem- 

 perate regions each claim a part of the South African coast, and the 

 latter terminates at the Cape of Good Hope. 



It hence follows that Port Natal, in latitude 30° south, the Hawaiian 

 Islands, and Bermudas lie within regions of the same name. While 

 Cape Town, in latitude 34° south, is in a like region with northern 

 New Zealand, Valparaiso, the Atlantic shores of Portugal, and the 

 sea between Cape Hatteras and Cape Cod. 



> 

 Influence of Summer Heat. — The small annual range of temperature 



(twelve to fourteen degrees in most regions) has been remarked upon, 

 and we have further observed, that the extreme heat has far less influ- 

 ence on the distribution of species than the extreme cold. There are 

 however some cases in the colder seas, in which the range has but half 

 the extent here mentioned, and in such, the species are likely to differ 

 from those characterizing the same region under other circumstances, 

 approximating to those of the region next exterior. These cases are 

 certain islands, or the extremities of continents, which are exposed to 

 cold ocean winds and currents. The south shores of Fuegia and New 

 Zealand appear to be examples of this kind. 



We add a table, enumerating the more important lands or coasts 

 embraced in each of the regions, bringing together those which are of 

 like temperature, and which consequently may be most closely related 

 in species. It is partly in recapitulation of the preceding pages. 



I. TORRID ZONE. 



1. TORRID REGION. 



A. Atlantic. — 1. West India Islands. 



2. Coast of South America, from the northeastern cape of Yucatan, to a degree south 

 of Bahia. 



3. Coast of Africa, from 9° north to 5° north. 



