1470 CRUSTACEA. 



east it widens, and embraces the Azores and the African coast along 

 Morocco, together with the Straits of Gibraltar, and a large part of the 

 Mediterranean. Madeira lies upon its southern limit. It is, therefore 

 natural, that the same species should occur at the Azores, Madeira 

 and on the African coast, and be excluded wholly from the Atlantic 

 coast of Europe. This, according to Prof. Forbes, is the fact with the 

 Littorina striata, besides other species. The coasts of Portugal and the 

 Azores are in different re g ions. 



The fiouth Temperate Eegion extends to Maldonado at the mouth 

 of the La Plata, from near the parallel of 30° ; along the African 

 coast it reaches over more than twice the number of degrees of lati- 

 tude, to within five degrees of Cape Town. 



Atlantic Subtemperate Regions, hetween 56° and 50° P. — The northern 

 of these regions, like the preceding, can scarcely be distinguished on 

 the coast of the United States, as the lines 50° and 56° F. fall nearly 

 together at Cape Hatteras. On the eastern side of the Atlantic, it 

 occupies the coast of Portugal to latitude 42° north, having a width 

 of five degrees. It thus corresponds to the so-called Lusitanian Region. 



The southern includes the mouth of the La Plata on one side, and 

 on the other the coast near Cape Town, beyond which it extends to 

 the Ca,pe of Good Hope. 



Atlantic Gold Temperate Regions, between 50° and 44° F. — The coast 

 from Cape Cod to Cape Hatteras belongs to the Northern Cold Tempe- 

 rate Region. Passing easterly, this region is but a narrow line of 

 water for thirty degrees of longitude, after which it expands, and 

 finally terminates between Western Ireland and latitude 42° on the 

 Spanish coast. The British Channel, the Bay of Biscay, and Vigo 

 Bay, Spain, are within the limits of this region. 



The southern embraces the coast of South America along by Rio 

 Negro for about five degrees, and passes wholly to the south of Africa. 



Atlantic Subfrigid Regions, between 44° and 35° F. — The coast of 

 Massachusetts, north of Cape Cod, of Maine and Newfoundland, and 

 all Northern Britain, the Orkneys, Shetlands, and Faroe Islands, per- 

 tain to the Northern Subfrigid Region ; while the southern, includes 

 the Falklands, Southern Patagonia, and Fuegia. 



Atlantic Frigid Regions, beyond 35° F. — Greenland, Iceland, and 

 Norway are within the northern of these regions, and the South Shet- 

 lands, Sandwich Land, and South Georgia, within the southern. 



