126 HISTORY OF THE EUROPEAN FAUNA. 



it must be remembered that one stage only can be 

 shown on the map, and that the sea covered more 

 ground a little later. Many of the smaller islands in 

 the glacial sea, too, are not shown. The map, in fact, 



FlG. 6. Map of the British Islands, showing approximately in what 

 manner the sea may have invaded the country from the east during, 

 or shortly after, the Forest-Bed period. The darkly shaded 

 parts indicate the areas covered by water, and the lightly shaded 

 and white portions what was land at that time. 



