66 Proceedings of the Boyal Physical Society. 



wliicli are got from the Bass Eock in the Firth of Forth, 

 where in some years not more than 800 are obtained. 



SowMeria mollissima (Linn.), Eider Duck. — Very plentiful 

 on Eona, building among the grass at some distance from the 

 water. I also took a nest with four fresh eggs on Sula 

 Sgeir. 



Hoematopus ostralegus (Linn.), Oystercatcher. — Several 

 pairs were found on North Eona, where I took a nest on the 

 verge of the cliff at the height of about 200 feet. I never 

 saw an oystercatcher's nest in so exalted a position before. 



Numenius arquata (Linn.), Curlew. — About five or six- 

 pairs near the centre of North Eona. They were very noisy, 

 and I think were breeding, althoudi, as midit have been 

 expected, we could not find th§ young birds. I was sorry I 

 could not shoot a specimen, as it seemed to me to be a 

 strange place for curlews. 



Larus argentatus (Gmel.), Herring Gull. — I noticed several 

 pairs of these birds on Eona, but was unable to get any of 

 their eggs. 



Larus marimcs (Linn.), Greater Black-Backed Gull. — 

 There was a large colony of these birds on the low point at the 

 western end of Eona, just below where the ruins are situated. 

 The ground was all littered over with feathers, nest material, 

 etc., and the young birds were to be seen hiding under the 

 stones, while the old ones created a terrible din overhead, 

 now and then swooping down unpleasantly near the heads of 

 the intruders into their haunts. I did not notice any lesser 

 black-backed gulls (Z. fuscus), though I have no doubt they 

 were there. 



Pissa tridactyla (Linn.), Kittiwake. — A large colony of 

 these birds on the north side of Sula Sgeir ; also another on 

 the north-west side of Eona, where there are some very large 

 caves. Both these places are practically inaccessible. 



Procellaria leucorrhoa (VieilL), Leach's Petrel. — Found, as 

 before stated, on Eona only, breeding in companies. I may 

 note that I found no trace or appearance of the stormy petrel 

 (P. 2yclagica) on either island. 



Pvffimts anglorum (Tem.), Manx Shearwater. — I could not 

 find a nest of this bird on Eona, although I saw the bird 



