Mr. YaAnnELL on a new Species of Wild Swan. .. 449 
the oldest and most perfect specimen of each sort I have been 
able to procure during the present winter, exhibit the real dis- 
tinctions in a manner not to be easily mistaken. 
New-species. Hooper. 
Weight . ea ges. ou TENE 24 ]bs. 
Ft. Inch. Ft. Inch. 
Point of the beak to the end of the tail 3 9 97g 
Width with wings extended . . . 6-3 T^ 30 
Point of beak to the edge of the forehead 0-831 0^ ^44 
SFO O 43 0 51 
occiput . 0-°* 64 Q oag 
Carpus to the end of the primaries . O 201 0 251 
Tail feathers in number 1g —- 20 
Length of tarsus . O° St pev 
— middle toe 05r 0 61 
L— —2 intestines. — .". 7 ; .710 g 191919 
ceca . | O 10 Q 414 
breast bone . 0- 6f 0 8 
Dépi of insertion of the erithea’ Hiiti 0-- ‘SE ors 
Length of bronchial tubes. . . . . O ud 0-9 
The anatomy of the Hooper is too well known to require 
further notice, except on some points of comparison. The fold 
of the trachea confined within the keel, never departs from the 
vertical position in this species at any age; nor have I ever. 
seen, in the oldest examples, the slightest appearance of exca- 
vation in the sternum itself. In the new species, on the con- 
trary, the trachea will always be found to have assumed the 
horizontal direction in old birds; and even when young, the 
sternum is excavated to a greater depth ready to receive the 
fold of the trachea, to be developed at a subsequent period. 
The depth of the insertion of the fold of the trachea in the old 
3M 2 Hooper 
