Puate IV. PaGes 86, 88. 
HERRING GULL. 
Length, 24-00 inches. Adu/t, back and wings pearl-gray; end of pri- 
maries marked with black; rest of plumage white. Young, dark gray- 
ish, primaries and tail brownish black. 
PETRELS. 
Length, 7°50 inches. Black, upper tail-coverts white. 
