to circumstance, upon the ledges of cliffs or on the 

 shore ; the eggs are laid in June. 



Mr. Saunders informs us that the migrations of this 

 species extend to the Mediterranean and Black Seas, 

 but it is certainly a very scarce visitor to the former. 

 The only two specimens of this Gull in my own pos- 

 session were obtained off Great Yarmouth in the winter 

 season. 



