fair scattering on west coast. Nesting.—L. glaucus. Saw one individual in Blue Mull Sound.
Rissa tridactyla. Large colonies in several places. Nesting.
Stercorarius catarrhactes. Small colonies on Foula, mainland, and Unst. Eggs found.—S. crepidatus. Breeding in considerable quantities. Eggs found.
Alca torda. Plentiful on suitable cliffs. Eggs found.
Uria troile. Saw many colonies on west coast. Nesting.—U. grylle. Scattered almost everywhere on coasts. Eggs found.
Fratercula arctica. Vast numbers on Unst. Eggs found.
Colymbus glacialis. One pair near Clonstel. Eggs found.—C. septentrionalis. Several pairs near Walls. Eggs found.
Fulmarus glacialis. Large colony on Foula. Eggs found.
Puffinus anglorum. Colony on Foula; one bird, Unst. Eggs found.
Procellaria pelagica. Saw few at Hermaness. One egg found.
