108 
Genus Cygnus. 
Only one species, the C. atratus , is, I believe, found south of the 
line ; for the Black-necked Swan of Chili will doubtless prove to be 
generically distinct. 
544. Cygnus atratus Yol. VII. PI. 6. 
This “ rara avis in terris” is not only strictly confined to Austra- 
lia, of which country it forms one of the most ornamental of its 
feathered tribes, but is so exclusively an inhabitant of the southern 
districts, that no notice has been recorded of its having been seen in 
Torres’ Straits, or on any part of the north coast. 
Genus Casarca. 
This ornamental section of the Anatidce is not very numerous in 
species. 
545. Casarca Tadornoides Yol. VII. PL 7. 
A beautiful representative of the C. rutila of Europe. 
Genus Tadorna. 
546. Tadorna Radjah Yol. VII. PI. 8. 
An equally beautiful representative of the T. Vulpanser. 
Genus Anas. 
Of true Ducks three species are found in Australia. 
547. Anas superciliosa, Gmel. Vol. VII. PI. 9. 
This bird assimilates very closely in its structure and in its eco- 
nomy to the Anas Boschas of Europe, but in its plumage it is very 
different. 
548. Anas naevosa, Gould Vol. VII. PI. 10. 
A very singular Duck, perhaps more nearly allied to Chaulelas- 
mus than to Anas. It is a very rare bird, and has only yet been 
seen on the western and southern coasts of Australia ; it probably 
inhabits the distant interior. 
549. Anas punctata, Cuv Vol. VII. PI. 11. 
This species has much the appearance of the Teal (genus Quer- 
quedula ), but in its structure is nearly allied to the true ducks (ge- 
nus A?ias), with which I have provisionally placed it. 
Genus Spatula. 
The great continents of America, Africa, Asia and Australia, are 
each inhabited by one or more species of this restricted genus. 
550. Spatula Rhynchotis Vol. VII. PI. 12. 
This bird is, I believe, peculiar to Australia. 
Genus Malacorhynchus. 
A very delicate form, of which the single species, confined to 
Australia, is the only one known. 
