on some rare British Birds. 269 
- TzrRAo Tetrix. 
The trachea is considerably enlarged at the division of the 
bronchie ; the enlargement is not bony, like the labyrinths of 
some of the Duck genus, but soft and pulpy. As Dr. Latham 
seems to think that there is no peculiarity of structure in the 
trachea of any of the British Grous*, perhaps this may be a 
disease, though it has not much of that appearance; if not, it 
is a singular lusus nature. 
* Linn. Trans. vol, iy. p. 100. 
VII. 4n 
