CATALOGUE OF BRITISH BIRDS. 
209 
2. Cygnus americanus. The American Swan. 
Cygnus americanus, Sharpless, Amer. Journ. Sci. ^ Arts, xxii. 
p. ; Auduh, B. of Amer. pi. ; Macgill. Man. N. H. Ornith. ii. 
p. 157. 
(Edinburgh). 
b. Cygnus. 
3. Cygnus olor. The Mute Swan. 
Anas olor, Gmel. S. N. i. p. 501 ; Temm. Man. d*Orn. 1815, p. 
523. 
Cygnus gibbus, Bechst. Naturg. Dents, iv. p. 815 ; Brehm, Vog. 
Dents, p. 829. 
Cygnus olor, Boie, Isis (1822), p. 563 ; Steph. Gen. Zool. xii. p. 
15, pi. 38 ; Jenyns, Man. B. Vert. An. p. 228 ; Pr. Bonap. Geogr. 
Comp. List of B. p. 55 ; Keys. ^ Bl. Wirhelth. Enr. p. 82 ; 
Schleg. Rev. Crit. des Ois. I Enr. p. 110; Nanm. Vog. Dents. 
(1842) xi. p. 442, t. 295; G. R. Gray, Gen. of B. iii. p. 610. 
Cygnus mansuetus, Flem. Brit. An. p. 126. 
Cygnus sibilus, Pall. Zoogr. ii. p. 215. 
Mute Swan, Bew. Brit. B. (1804) ii. p. 277, fig. ; Yarr. Brit. B. 
2 edit. iii. p. 205, fig. 
Tame Swan, Penn. Brit. Zool. (1812) ii. p. 221. 
PL enl. 913 ; Gonld, B. of Enr. pi. 354. 
a. Great Britain. 
b. Great Britain. Presented by Dr. Dowler. 
c. Skeleton. England. 
?4. Cygnus immutabilis. The Changeless Swan. 
Cygnus immutabilis, Yarr. Proc. Z. S. 1838, p. 19 ; Pr. Bonap. 
Geogr. Comp. List of B. p. 55 ; Macgill. Man. N. H. Ornith. ii. 
p. 156 ; G. R. Gray, Gen. of B. iii. p. 610. 
Cygnus olor immutabilis, Schleg. Rev. Crit. des Ois. d’Enr. p. 112. 
Polish Swan, Yarr. Brit. B. 2 edit. iii. p. 225, fig. 
(East Coast of England). 
