The largest species known is the Stercorarius catarrhactes of ornithologists - the "Skooi" or "Bonxie" of the Shetlanders, a bird in size equalling a herring-gull, Larus argentatus.
Polnatorhinus (often incorrectly spelt pomarinus), about the size of a common gull, Larus canus, and presenting, irrespective of sex, two very distinct phases of plumage, one almost wholly sooty-brown, the other particoloured - dark above and white on the breast, the sides of the neck being of a glossy straw-colour, and the lower part of the neck and the sides of the body barred with brown; but a singular feature in the adults of this species is that the two median tail-feathers, which are elongated, have their shaft twisted towards the tip, so that in flight the lower surfaces of their webs are pressed together vertically, giving the bird the appearance of having a disk attached to its tail.
Mouette), for a group of sea-birds widely and commonly known, all belonging to the genus Larus of Linnaeus, which subsequent systematists have broken up in a very arbitrary and often absurd fashion.
We have then the genus Larus, which ornithologists have attempted most unsuccessfully to subdivide.
FULMAR, from the Gaelic Fulmaire, the Fulmarus glacialis of modern ornithologists, one of the largest of the petrels (Procellariidae) of the northern hemisphere, being about the size of the common gull (Larus canus) and not unlike it in general coloration, except thatits primaries are grey instead of black.