NATA.TORES. 28 



LARID^E. (Family v. continued.) 



347. BLACK-HEADED GULL. 



Xema Atricilla. Bonap. 



348. LAUGHING GULL. 



Xema Ridibundum. Sole. 



349. KITTIWAKE. 



Rissa Tridactyla. Leach. 



350. ROSS ROSY GULL. 



Rossia Rosea. Bonap. 



351. IVORY GULL. 



Gavia Eburnea. Boie. 



352. COMMON GULL. 



Larus Can us Linn. 



353. ICELAND GULL. 



Larus Leucopterus. Bonap. 



354. LESSER BLACK-BACKED GULL. 



Larus Fuscus. Linn. 



355. HERRING GULL. 



Larus Argentatus. Brunn. 



356. GREAT BLACK-BACKED GULL. 



Larus Marinus. Linn 



357. GLAUCOUS GULL. 



Larus Glaucus. Brunn. 



358. COMMON SKUA. 



Cataracta Skua. Brunn. 



359. POMARINE SKUA. 



Lestris Pomarinus. Tern. 



36fc RICHARDSON'S SKUA. 



Lestris Richardsoni. Swains. 



361. BUFFON'S, OR ARCTIC SKUA. 



Lestris Parasiticus. Illig. 



