DUTCH AND ENGLISH BIRDS. 7 
Bernicla ruficollis (Pallas). 
A rare winter visitor to Holland (f.1. five specimens in 
the Zool. Soc. Museum and Menagerie of Amsterdam) and 
the Br. Isl. 
Genus Cygnus. 
Cygnus olor (Gmelin). 
Has been obtained wild during the winter in the nor- 
thern provinces of Holland. As this species is kept so 
much in more or less domesticated condition especially in 
Noord and Zuid Holland, I think it open to doubt whether 
they were really wild birds. 
In the Br. Isl. the same thing occurs. 
Cygnus immutabilis Yarrell (var. of C. olor). 
Is kept very much like the preceding and has been 
shot apparently in wild state. 
An occasional winter visitor to the Br. Islands. 
Cygnus musicus Bechstein. 
A common winter visitant to Holland and Brit. Islands. 
Cygnus Bewicki Yarrell. 
A winter visitor to Holland, but less frequent than Cygnus 
musicus. 
A winter visitor to the Br. Isl. 
Genus Tadorna. 
Tadorna cornuta (Gmelin). 
Breeds in different places along the sea shore of Hol- 
land also far inland, in old rabbit-holes often at a great 
distance from the water, Resident in some places of the 
British Islands. 
(Tadorna casarca) (Linn). - 
Genus Mareca. 
Mareca penelope (Linn.). 
A winter visitor to Holland, seldom remaining to breed. 
Breeds in Scotland, on migration in winter elsewhere. 
(Mareca americana) (Gmelin), 
Notes from the Leyden Museum, Vol. XV. 
