362 THE ZOOLOGIST. 



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. 



Cohjmbus glacialis. One pair near Clonstel. Eggs found. — 

 C. scptentrionalis. 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. 





