SPREADING OP BIRDS. 67 



inhabit the Frigid and Temperate Zones, almost 

 between the 80th and 35th degree of Latitude : most 

 of them do not pass beyond the 50th degree from 

 the North. The Alca pica inhabits the Mediterra- 

 nean only ; and the A. cristatella, the Seas of Japan. 



2. On the Southern Hemisphere, Penguins (Apte- 

 nodytes, 'without wings') are found in the same 

 regions which correspond with those inhabited by 

 the Auks in the Northern Hemisphere. In some 

 regions of the Frigid Zone, for instance, about New- 

 Year's Island, according to Forster, they are most 

 abundant, but less numerous between the Tropics. 



3. The Terns (Sterna) spread over the whole sea, 

 from pole to pole. They inhabit Spitzbergen (S. 

 hirundo); Greenland, Kamtchatka, the Caspian Sea, 

 (S. Caspia) ; Africa (S. Africana) ; Egypt, Surinam, 

 (S. Surinamensis) ; Cayenne, New- Zealand, and 

 Sandwich Land. Seven species are also reckoned 

 to be natives of Germany. 



4. Petrels (Procellaria) are found in the seas 

 of the Cold and Temperate Zones of both Hemi- 

 spheres, and appear to be less abundant in the Warm 

 Zone. They are met with in the Southern Polar 

 Circle (P. gellida and glacialis) ; on the icy plains 

 near the North Pole (P. furcata) ; near Kamtchatka 

 (P. cequmoctialis) ; in the 25th degree N.L. (P.pella- 



