54 Proceedings of the Boxjal Physical Society. 



evidently contained young, far down a cliff at Eilean Dubh, 

 and right on the only track accessible even for a goat. A 

 goat with her kid were making their way along this path, 

 when their progress was stopped by the Gull, who, each 

 time they advanced, dashed at the intruders with outspread 

 wings and screaming hoarsely. We waited quite half an 

 hour watching the proceeding, and I was delighted to find 

 that the gallant bird made good her defence to the end. 

 Though not included by Mr Harvie-Brown in his list of 

 birds of Priest Island, the Common Gull nests there in 

 considerable numbers. 



27. Larus argentatus, J. F. Gmel. 



(Herring Gull.) 



Fairly common, though not nearly so abundant as the 

 Common or Lesser Black-backed Gull. I observed quite a 

 large number both on Priest Island and Glasleacbeg, and it 

 no doubt breeds on both. I found its nests only on Horse 

 Island and Eilean Dubh, where it almost invariably breeds 

 on the cliffs along with the Common Gull. Mr Bonar, 

 however, obtained its eggs from Sgeirean Glasa. 



28. Larus fuscus, Linn. 



(Lesser Black-backed Gull.) 



By far the most abundant Gull found in these islands. 

 It breeds in large numbers on Glasleacbeg, Priest Island, 

 Horse Island, Eilean Dubh, and Glasleac Mor, and, without 

 doubt, on several of the other islands, such as Tanera Beg 

 and Tanera More. The nests we found were invariably 

 placed in the heather. 



29. Larus marinus, Linn. 



(Great Black-backed Gull.) 



Common. It nests on Glasleacbeg, Glasleac Mor, and 

 Priest Island, the first named of these containing the largest 



