ADDENDA 
315 
moss lying on the ground within, while in a hole at the height of 
about fifteen feet the sticks of the structure (heather, gorse, and 
thorn, mostly slender) still remained, close to the mouth of the 
opening, which was not deep, and easily visible from beneath. 
The late Mr. T. H. Kinvig, who had some experience of the 
nesting habits of the Chough, thought that an unusual number of 
its eggs were unfertile, an interesting observation in view of the 
decrease of the species. 
LABUS CAN US. COMMON GULL. 
Mr. J. J. Gill, of Ramsey, has kindly communicated to me that 
in June 1904 an egg, still unblown, was shown to him which he 
at once recognised as belonging to the species, and he learned that 
it had been taken on the Manx coast on the 23rd of that month, 
there being two others in the same nest. The reported finder does 
not now recollect having met with any eggs at this place smaller 
than those of the Herring Gull, which abounds there, and in May 
1905 I failed to see any Common Gulls along these shores, which 
however seem very suitable for their residence, being comparatively 
low, with many of the small rocky irregularities amidst which this 
species likes to nest. The specimen egg is, without doubt, a 
Common Gull's ; the date is very late, but this may perhaps be 
accounted for by the constant robbery (in spite of Acts of 
Tynwald) which takes place among the Gulls' nests on these 
easily accessible rocks. 
LOMVIA TROILE. COMMON GUILLEMOT. 
Among a large number of this species observed on the Calf in 
1905, Mr. Graves and I could make out only one bird of the 
Ringed variety, and I have found no note of other Manx speci- 
mens, but this point deserves further attention. Of many eggs 
seen on the same islet, an immense majority was of a green colour. 
