548 Capt. Sanine’s Memoir on the Birds of Greenland, $c. 
Before I had the pleasure of meeting with Mr. Temminck, he 
had designed to give the specific name of argentatus to the Eu- 
ropean bird; it will therefore remain as I have placed it at the 
head of this species: the name of glaucus, which in his Manuel 
was given to the Herring Gull, will be removed by him to the 
true Glaucous Gull. It is singular that Pennant, in his Arctic 
Zoology, under the head of Herring Gull, states that bird to be 
common in Greenland throughout the year; though no other 
writer, as far as my observation has extended, mentions the cir- 
cumstance, and we did not observe a single one with black pri- 
mary quill-feathers during our voyage in the Straits. 
21. Larus EsunNEvus. Ivory Gull. 
L. Eburneus. Gmel.i. 596. Lath. Ind. Orn. ii. 816. Temm. 498.—Ivory Gull. Lath. 
Syn. vi. 377. Arct. Zool. ii. 529. & Supp. 70.—L. Candidus. Fabr. 103. Müll. p. viii. 
Abundant in Baffin’s Bay. Authors describe the length of 
this bird as sixteen or seventeen inches; the matured specimens 
obtained, averaged twenty inches; but an immature one measured 
an ineh less. Weight about twenty ounces. Nothing can exceed 
the beauty of the delicate snow-white plumage of this species in 
its maturity: I apprehend that this takes place at the end of the 
second year; on the 24th of August the young birds were ob- 
served 3t flight, much mottled with brown about the head, and 
probably also about the wings, though not so visibly. A specimen 
killed the first week in June, of a bird apparently of the pre- 
ceding year, has a few light-brown feathers about the bill, extend- 
ing towards the eyes, a very small transverse band of brown spots. 
across the primary wing coverts, thickest at the point of the 
wing; the primary quill and the tail feathers slightly tipped with 
brown. Since my return I have seen a specimen of an immature 
bird with the ends of the primary quill-feathers and of the tail- 
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