X 



-v- 



V 



PLATE IV. 



HERRING GULL. 



PAGES 86, 88. 



Length, 24-00 inches. Adult, 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. 



7 -SO 



PETRELS. 

 "Blank, iitmer tail-fiovftrttt whit,. 



