450 
Major W. R. Thompson on the [Ibis, 
Puffinus puffinus. The Manx Shearwater. 
I have only come across this bird on one occasion. During 
the last week in May and the first day or two in June of 
this year (1920; it was comparatively plentiful off the shore. 
I do not know that it breeds here, but if not, its appearance 
at this time of year is certainly curious. I may add, how¬ 
ever, as a possible explanation of the circumstance, that 
the period referred to was noticeable for the large shoals 
of young pollack, the herds of porpoises, and the flocks of 
gannets in the vicinity. 
Mr. Eagle Clarke found it very numerous off the Casquets 
on the 30th of September, 1898, and Mr. Cecil Smith 
considers it an occasional wanderer to the Channel Islands. 
Puffinus gravis. The Great Shearwater. 
Mr. Eagle Clarke saw a single example of this bird, 
among the Manx Shearwaters, off the Casquets on the 
30th of September, 1898, and Mr. Cecil Smith includes 
it as an occasional wanderer to the Islands, on the strength 
of having seen ft small flock of four or five of them in 
the Channel in July 1866, whilst still within sight of the 
Casquets. I have myself occasionally noticed this bird 
whilst crossing between Guernsey and Weymouth. 
Colymbus arcticus. The Black-throated Diver. 
I saw one of these birds in the Roads on the loth of 
April, 1914. It was fishing close under the breakwater. 
Colymbus immer. The Great Northern Diver. 
Mr. Cecil Smith says :— 44 The Great Northern Diver is a 
common autumn and winter visitant to all the Islands.” 
I have not myself seen it, and think that they have become 
less numerous since Mr. Smith’s time—at any rate in this 
locality. 
Colymbus stellatus. The Red-throated Diver. 
Occasionally visits the Roads and Longy Bay in winter, 
usually during rough weather or after a storm. 
