MR. DAVIES' confirmation of my results is very interesting, and in many ways, I think, conclusive. So far as my memory serves me (I have not here access to a collection), I can bear out all

his facts. I regret that I have never taken the names of the different species in which I have observed the blade. The Pomarine Skua is one. A friend tells me that he has also noticed a

jagged blade; and, he believes, in a guillemot.

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