450 Mr. YARRELL on a new Species of Wild Swan. 
Hooper is but 3 inches in a breast bone of 8+ inches in length ; 
while the depth of insertion in the new species is 53 inches in a 
breast-bone of only 62 inches. The bone of divarication, placed 
perpendicular to the base of the sternum, is in the adult birds 
of both these species of the same height, that is, 14 of an inch 
from top to bottom, and is therefore much larger in proportion 
in the new species ; in this bird also it is considerably convex on 
each outside. The bone of divarication in the Hooper is com- 
pressed, and the membrane connecting this bone with the bron- 
chial rings is not provided with the semicircular bone and mem- 
brane which so remarkably assists in sustaining and protecting 
the same delicate structure in the new one. 
The bronchial tubes in the Hooper are invariably long ; those 
of the new bird are as invariably short ; but the arrangement of 
the muscles of voice, and the beautiful manner in which the 
inner ascending curve of the trachea is supported by a tendinous 
fascia (as shown at Tan. XXIV. Fig. 2.), are the same in both 
birds. 
By a paper in the Philosophical Transactions, vol. 56. p. 204. 
it appears, that a wild Swan of this new species, brought alive 
from Philadelphia, but which died soon after, had been dissected 
by Dr. Parsons, but without considering it to be distinct from 
the Hooper. 
Hearne met with both species of our Wild Swans at Hudson's 
Bay, and the following two short extracts from the published 
account of his ** Journey to the Northern Ocean" refer particu- 
larly to this subject. 
“ Swans.—There are two species of this bird that visit Hud- 
son's Day in summer ; and only differ in size, as the plumage of 
both are perfectly white, with black bill and legs. "The smaller 
sort are more frequent near the coast, but by no means plentiful, 
and are most frequently seen in pairs, but sometimes single, 
probably 
