While we know of regular occurrence and may assume that the bird has been breeding on the north and west side of Newfoundland, and in east Greenland (opposite Iceland). The remains of the Great Auk and its eggs in collections are more numerous than one would think, considering the enormous prices paid for mounted specimens and eggs. There are at present known 79 or 80 skins, 26 or 27 skeletons, a great quantity of detached bones, and about 73 eggs. I HAVE IN MY MUSEUM: 1. One adult female, formerly in the collection of the late Comte de Riocour at Vitry-le-François, in France. I bought this specimen from the late Alphonse Boucard, together with the bulk of the birds of the Riocour collection. It is evidently an adult female, having the white lines on the bill not very much developed, and showing a distinct grey tinge on the flanks. This shade is present in both my Great Auks; the feathers of the flanks, just under the wing, are nearly white, with a conspicuous, very light grey border. This grey tinge is present in all females, but appears to be absent in adult males. My bird is apparently in worn breeding plumage. As it was not very well mounted and the feet slightly damaged, I had it reduced to a "skin." {156} 2. Another adult female. I purchased this from Mr. Rowland Ward, who had it from Mr. Leopold Field in London, in 1897. According to a letter, dated Paris le 20 Jan., 1890, written by the late A. Boucard, who sold it in that year to Mr. Field, the history is as follows: "This bird was captured in Iceland in 1837, did first belong to Mr. Eimbeck of Brunswick and afterwards in the collection of Mr. Bruch from Mayence." We must accept this information by the late A. Boucard as correct, though it is difficult to understand that in the most painstaking and exact list of remains of the Great Auk, by Prof. Wilhelm Blasius of Braunschweig, or anywhere else, no mention is made of a specimen in the possession of the late Eimbeck, or the late Bruch. Moreover, we have no explanation where this Auk has been between the time of Bruch's death and 1890, when Boucard sold it to Mr. Field in London. This specimen has been described as "immature," but this is a mistake. Evidently it arose from some white speckles being visible on the neck _in the photograph_ (see Symington Grieve, Trans. Edinburgh Field Nat. and Micros. Society, explanation to plate III, on page 269). The specimen itself, however, shows no white speckles, but only worn feathers, out of which the illusion arose in the photograph. This error has also been transferred to the admirable treatise on the Great Auk in the New Edition of Naumann. The grey shade "on the body lower than the wing," mentioned by Mr. Symington Grieve, is not a sign of immaturity, but appears in all adult females, though it is said to be absent in males.