RED-CRESTED POCHARD. 



411 



Rosy-billed Duck, Metopiana pejJosaca, which was in the 

 same enclosure. 



The windpipe of the male is about nine inches in length ; 

 the tube is narrow in diameter at the middle and near 

 the end, but enlarged at the commencement and again 

 below the middle, as shown in the representation of the 

 lower half. The labyrinth in the Ducks of this division is 



composed partly of bone, and partly of membrane. The 

 right and left surface are here shown ; the membrane sup- 

 ported by delicate portions of bone diverging from an outer 

 bony ring. 



In the adult male in spring the beak is crimson or ver- 

 milion-red ; the nail white ; the irides reddish-brown ; the 



