THE AMERICAN JOURNAL 
OF 
ANATOMY 
EDITORIAL BOARD 
CHARLES R. BARDEEN 
University of Wisconsin 
Henry H. DoNaALpson 
G. Cart HUBER J. Puayrain McMourrica 
University of Michigan 
University of Toronto 
GerorGE S. HUNTINGTON GEORGE A. PIERSOL 
The Wistar Institute Columbia University University of Pennsylvania 
Simon H. GaaGe 
Henry McE. KnNower, SECRETARY 
Cornell University 
University of Cincinnati 
VOLUME 25 
PAIN UA YY 
1919 
THE WISTAR INSTITUTE OF ANATOMY AND BIOLOGY 
PHILADELPHIA, PA. 
