THE GANNET'S ANATOMY 539 



size amongst birds. This structure, which is special to 

 birds, is not used for lubrication of plumage by the 

 Gannet, as far as I could judge, whatever its function 

 may be. 



The Muscles, Reproductive Organs, etc. — The muscular 

 system, the reproductive organs, the heart and lungs, do 

 not call for any special description, although to a well- 

 trained anatomist they would probably present a few 

 peculiarities ; but MacgilKvray has nothing to say about 

 them. 



The ambiens muscle, wliich runs along the inner side of 

 the leg, and Avhich for a time was thought of so much 

 importance, exists in the Gannet, and, in fact, in all the 

 Stegano'podes. 



