Vlll PLATES IN VOL. VI. 



To facts 

 page 



21. Great Black-headed Gull. Lotus ichthyaelus, 



Pall 48 



22. Common Gull. Larus canus, Linn 49 



23. Herring-Gull. Larus argentatus, J. P. Gmelin. 51 



24. Lesser Black-backed Gull. Larus fuscus, Linn. 55 



25. Great Black-backed Gull. Larus marinus, Linn. 57 



26. Glaucous Gull. Larus glaucus, O. Fabricius . 59 



27. Do. Do. Immature 60 



28. Iceland Gull. Larus leucupterus, Faber ... 62 



29. Kittiwake. Rtssa tridactyla (Linn.) .... 63 



30. Ivory Gull. Pagophila eburnea (Phipps) ... 68 



31. Great Skua. Lestris catarrhactes (Linn.) . . 69 



32. Twist-tailed Skua. Lestris pomatorhinus, Tenim. 



:} 



74 



33. Do. Do. 



34. Richardson's Skua. Lestris richardsoni, Swainson. 75 



35. Long-tailed or Buffon's Skua. Lestris para- 



siticus (Linn.) 77 



36. Razorbill. Alca torda, Linn 79 



37. Great Auk. Aha impennis, Linn 81 



38. Common Guillemot. Uria troile (Linn.) ... 83 



39. Brunnich's Guillemot. Uria bruennichi, E. 



Sabine. Summer plumage 87 



40. Do. Do. Winter plumage 88 



41. Black Guillemot. Uria gry lie (Linn.) ... 91 



42. Little Auk. Mergulns alle (Linn.) 94 



43. Puffin. Fratercula arctica (Linn.) 96 



44. Great Northern Diver. Colymbus glacialis,~Linn. 97 



45. White-billed Great Northern Diver. Colymbus 



adamsi, G. R. Gray 102 



46. Black-throated Diver. Colymbus arcticus, Linn. 104 



47. Red-throated Diver. Colymbus septentrionalis , 



Linn 105 



48. Great Crested Grebe. Podiceps cristutus (Linn.). 109 



49. Red-necked Grebe. Podiceps griseigena (Bod- 



daert) Ill 



