52 Proceedings of the Boyal Physical Society. 



18. Mergus serrator, Linn. 

 (Ked-breasted Merganser.) 

 One seen swimming off Eilean Fada Mor. 



19. CoLUMBA LI VIA, J. F. Gmel. 



(Eock Dove.) 



This bird, though found on most of the islands on which 

 we landed, is nothing like so common as one would expect 

 it to be, considering the locality is so well suited to its 

 requirements. The very remarkable fissure in Tanera Beg 

 is one of its breeding-haunts, but even there we saw very 

 few pigeons. Mr Bonar explored a cave in Eilean Dubh 

 frequented by the Rock Dove, but saw only four. 



20. HiEMATOPUS OSTRALEGUS, Linn. 



(Oyster-Catcher.) 



Exceedingly abundant — perhaps the very commonest bird 

 found on these islands. It nests in every one of them 

 visited by us. 



21. TOTANUS HYPOLEUCUS (Linn.). 



(Common Sandpiper.) 



One seen on the shore of Tanera More, where, no doubt, 

 the bird nests. One Sandpiper was observed by Mr Harvie- 

 Brown on Priest Island. 



22. Tot ANUS calidris (Linn.). 



(Common Redshank.) 



We found the head of a Redshank in the Peregrine's 

 eyrie on Priest Island. I never saw or heard the bird on 

 any of the Summer Islands or on the peninsula of Coigach. 



