BIOLOGICAL BULLETIN 



OF THE 



flDarine Biological Xaborator^ 



WOODS HOLE, MASS. 



VOL. XLVII AUGUST, 1924 Xo. 2 



CONTENTS 



O. E. PLATH. Miscellaneous Biological Observations on Bumblebees. . 65 

 F. G. HALL. The Functions of the Swimbl adder of Fishes : . . . 79 



PUBLISHED MONTHLY BY THE 



MARINE BIOLOGICAL LABORATORY 



PRINTED AND ISSUED BY 



LANCASTER PRESS, INC. 

 LANCASTER, PA. 



AGENT FOR GREAT BRITAIN 



WHELDON & WESLEY, LIMITED 

 2, 3 and 4 Arthur Street, New Oxford Street, London, W. C. 2 



Single Numbers, 75 Cents. Per Volume (6 numbers), S3.OO 



Entered October 10. igoa. at Lancaster, Pa., as second-class matter under Act of Congress of July 16. 1804- 



