CONTENTS. vii 



Plate Page 



Lesser Black-backed Gull, . XCV. 509 



Common Skua, ... C. 514 



Pomarine Skua, . . . CI. 517 



Arctic Skua, . . CI. &. CI.* 520 



Fulmar Petrel, .... CII. 525 



Cinereous Shearwater, . . . CII.* 528 



Mank's Shearwater, . . . CII. 529 



Common Storm Petrel, . . . CIII. 533 



Fork-tail Storm Petrel, . . CIII. 537 



