GOLDEN-EYE. 



441 



by which time the head and neck show a great deal of dark 

 green. 



The downy nestling is deep sooty-brown on the upper 

 half of the head, hind neck, and rest of upper parts ; a 

 few white markings near the junction of the pinions, and 

 a spot of white on the rump behind each thigh ; chin and 

 throat pure white, followed by a dusky-brown collar ; under 

 parts greyish-white, mottled with brown on the flanks. 



The trachea of this species is singular in its form, differ- 

 ing from the character of those of the Ducks in general, 

 and bearing some resemblance to those of the Mergansers, 

 both in the tube and in the labyrinth. The length is about 

 nine inches, the diameter of the upper half of the tube 

 equal in size, and small ; at the commencement of the 

 second half, the tube is dilated to four times the previous 

 size, and the rings are so arranged as to lie flat upon each 

 other. The last, or fourth, portion again contracts till it 

 ends in the labyrinth, of which the vignette below represents 

 the surface nearest the back of the bird. The bronchial 

 tubes are observed to be unequal in length, to compensate 

 for the obliquity of the inferior surface of the labyrinth, 

 which, as usual, is made up partly of bone and partly of 

 membrane. The voice is said to be very loud : whence, 

 or from the noise of the flight, the name clangula. 



VOL. IV. 



8 I, 



