The terrestrial mammals and birds of North-East Greenland. 



117 



brown undulated of the sides of the body may — on almost all 

 Ptarmigans of both sexes — be seen some feathers, which are partly 

 white and partly undulated; it is perhaps such feathers, that have 

 given room for the supposition, that a change of colour Avithout 

 moult takes place from autumn to winter-plumage. The collected 

 skins do not confirm such a supposition, because pure white fea- 

 thers may be found everywhere. 



From the autumn-plumage the cock goes to the white plumage 

 again. 



I do not dare to say anything with certainty regarding the 

 change of the claws of the Ptarmigans, as I on this point have 

 found the greatest dissimilarities in individuals of both sexes in 

 every season and of different ages. 



For the zoological museum in Copenhagen were collected the 

 skins of 14 full-grown Ptarmigans and three almost full-grown 

 young ones and one smaller young in spirit; further 1 egg. 



The following measurements have been taken: 



Red-throated Diver. Colymbus septentrionalis L. 



The Red-throated Diver occurred very commonly in summer as 

 well near the coast as far up in the country. It was also to be 

 seen at the mouth of the rivers and — though more rarely — in 

 small gulfs and fjords. 



