500 THE GANNET 



osteology by Dr. R. W. Shufeldt, published some twenty-four 

 years ago in the United States.* 



In that author's opinion a pneumatic state exists over 



SKELETON IN THE ATTITUDE OF PLUNGING. 



almost the entire skeleton — a condition presumably pro- 

 vided for the same purpose as the subcutaneous air-sacs 



*" Osteology of Sula Bassana,'" by Dr. R. W. Shufeldt ("Proceed- 

 ings of the United States National Museum," 1888, pp. 287-309). 



