372 BIRDS OF THE BRITISH ISLES. 



(Bull 



JOHN DUNCAM - 



THE Ivory Gull (Pagophila eburnea, Phipps) is a rare no- 

 madic autumn and winter migrant to the British Islands, 

 and is found inhabiting the Circumpolar Regions. The 

 adult has the whole of the plumage pure white ; irides, 

 deep brown ; bill, greenish -grey, tip, yellow; legs and feet, 

 black. Length, from sixteen to eighteen inches. The 

 young in first plumage are described as being nearly of 

 a uniform ashy-grey. 



