INTRODUCTION. 
CXXXl 
Genus Colymbus. 
361. Colymbus glacialis ........... Vol. V. PI. XLTII. 
Great Northern Diver. 
One of the finest of our native birds, but does not breed with us. 
362. Colymbus arcticus ........... Vol. V. PI. XLIV. 
Black-throated Diver. 
This may be considered a resident species, although it is but sparingly observed at any time. In 
winter the young are frequent along our southern coasts, while in summer most of the northern lochs of 
Scotland have each its breeding pair of birds — among other places, Loch-y-vraon and Loch Drome in 
Ross-shire, part of the fine property of John Fowler, Esq. 
363. Colymbus septentrionalis .......... Vol. V. PI. XLV. 
Red-throated Diver. 
Like the last a resident species, breeding in the same parts of the country. 
Family ALCAD^E. 
Formerly Britain could boast of having five species of this remarkable family of northern sea-birds ; but 
tbe finest of them, the Great Auk, is now gone from the face of the waters ; and if it is still enumerated 
in the present work, it is because we cherish the recollection of so singular a bird. 
Genus Alca. 
364. Alca impennis Vol. V. PI. XLVI. 
Great Auk. 
365. Alca torda Vol. V. PI. XLVII. 
Razorbill. 
A common cliff-bird, breeding all round our coasts, and a constant resident on our seas. 
Genus Uria. 
366. Uria troile Vol. V. PI, XLVIII. 
Common Guillemot. 
Like the last very numerously dispersed round the whole of the islands and islets of Britain ; breeds on 
the rocks ; lays but a single egg. 
