296 BRITISH BIRDS' EGGS. 



scribed as most frequently being of a greenish or olive-green 

 tint, blotched with grey and brown. 



Boss's EOSEATE GULL. Larus Rossii. This species has 

 received its name from Commander James Clark Boss, in me- 

 mory of his unwearied exertions in the promotion of Natural 

 History during the Arctic voyages in which he bore a part. 

 It is quite a northern species. " Commander Boss, in his 

 Zoological Appendix to Sir Edward Parry's narrative of his 

 most adventurous boat- voyage towards the Pole, relates that 

 several were seen during the journey over the ice north of 

 Spitzbergen, and Lieutenant Porster also found the species 

 in Waygait Straits, which is probably one of its breeding- 

 places" (Mr. YarrelFs Second Supplement, p. 60). A spe- 

 cimen of this Gull was shot in Yorkshire, in the parish of 

 Kirby, in -February 1847. Of the peculiar habits or nidi- 

 fication of this species we can say nothing. 



THE IVORY GULL. Larus eburneus. This is, both in 

 Britain and on the European continent, a rare species, be- 

 coming more frequent in its occurrence as we advance north- 

 ward, and finding its true home in high northern latitudes. 

 In these situations it has been met with both by the whaling- 

 vessels and by nearly all the northern expeditions. "Dr. 

 Bichardson observed it breeding on the cliffs of Cape Parry, 



