ALCAD./E. 255 



interior could be discerned, when the internal colour of the 

 eggs of the Brunnich's Guillemot would be found to be a 

 blue-green, while that of the commoner species would be of 

 a yellowish -white ; and this opinion was certainly borne out 

 to a considerable extent by a comparison of several speci- 

 mens belonging to the present and the commoner species 

 on the occasion. The Brunnich's Guillemot lays one egg 

 only, upon the bare rock. 



THE BRIDLED GUILLEMOT. Una lacrymans. In Ice- 

 land this species is found in considerable numbers; it is 

 also reported to breed on the coast of Wales. The Rev. 

 F. 0. Morris states, upon the authority of Mr. Wollaston, 

 that this species breeds regularly at Bridlington, and that 

 its eggs are invariably white. We have not had an oppor- 

 tunity of comparing a number of these eggs, but the only 

 specimen which we possess, taken in one of the Orkney 

 Islands, is of a yellowish- white colour, with numerous and 

 somewhat small markings of grey, brown, and deep neutral 

 tint approaching to black ; the size and form nearly like 

 that of the eggs of the Common Guillemot. 



THE BLACK GUILLEMOT. Uria grylle. This is a more 

 northern bird than the last, the coast of the south of Scot- 

 land being near to its usual southern range in Britain. It 



