At 5fa.' 



.rrt\ ■ .t^-JCM;..-. 



\ 



.J»i^..,Mk,-Mm^. f ..»t .<.,U~..K.^i. ,.,- 



Plate IV, 



HliRRINU GULL. 



Length, 3400 inches. Adult, back and whigs pearLgraj' ; end of primaries 



marked uitli black ; rest of plumage white. Yuiuuj, darit grayish, primaries 



and tail brownish black. 



PETRELS. 



Length, 7'50 inches. Black, upper tail-coverts white. 



