OF THE NETHERLANDS. 



139 



series of this species, which is fortunately still breeding in 

 our country 1 ). 



Anatidae. 



• 29. Cygnus cygnus (L.). [Wilde zwaan]. 



The Museum purchased five specimens, viz. : 

 adult cf, 3 March 1906, Texel; 

 adult 9, 20 December 1906, Texel; 

 adult cf, February 1907, Ierseke, province Zeeland; 

 adult cf, 27 November 1907, Texel; 

 young 9> 7 January 1908, Kagermeer, Zuid-Holland. 



30. Cygnus bewickii Yarrell. [Kleine zwaan]. 



In the latter years we did not receive this species. We 

 possess the following specimens captured in our country: 

 adult captured alive in Holland and received 17 July 

 1855 from the Zoological Garden at Amsterdam 

 (Schlegel, Cat. Anseres, Cygnus minor, n°. 1) ; 

 adult 9, 15 March 1856, Holland, without exact locality 



(Schlegel, ibid. n°. 2); 

 adult cT, 20 March 1858, near Meppel, province Drenthe 



(Collection van Wickevoort Crommelin, 237 — 1) ; 

 adult 9» 16 December 1882, Angerlo near Doesburg, pro- 

 vince Gelderland. Presented by Dr. R. Horst. 



31. Cygnus olor (Gmelin). [Knobbelzwaan]. 



It will be always very difficult to state, if the specimens 

 shot in our country are wild birds or domesticated ones. The 

 so-called Cygnus immutabilis Yarrell is without doubt a race 

 arised in captivity. True C. olor we did not receive; only two 

 specimens of the variety immutabilis, an adult female shot 



1) In the beginning of December 1906 an example of Phoenicopterus roseus 

 Pallas has been shot near Hindeloopen in the province Friesland. I have not 

 inserted this species in the list, because we have to do, very probably, with a 

 bird escaped from captivity. I have not seen the bird, but, judging from the 

 descriptions, it must be the named species. 



N otes from the Leyden Museum, Vol. XXX, 



