Salvin), without any great break, as far as fitness for sifting is concerned, through the beak of the Merganetta armata, and in some respects through that of the Aix sponsa, to the beak of the common duck.

In this latter species the lamellae are much coarser than in the shoveller, and are firmly attached to the sides of the mandible; they are only about fifty in number on each side, and do not project at all beneath the margin.

They are square-topped, and are edged with translucent, hardish tissue, as if for crushing food.

The edges of the lower mandible are crossed by numerous fine ridges, which project very little.