THE AMERICAN JOURNAL 



OF 



ANATOMY 



EDITORIAL BOARD 



Charles R. Bardeen 



University of Wisconsin 



Henry H. Donaldson 



The Wistar Institute 



Simon H. Gage 



Cornell University 



G. Carl Huber 



University of Michigan 



George S. Huntington 



Columbia University 



J. Playfair McMurrich 



University of Toronto 



George A. Piersol 



University of Pennsylvania 



Henry McE. Knower, Secretary 



University of Cincinnati 



VOLUME 28 

 NOVEMBER, 1920— MARCH, 1921 



THE WISTAR INSTITUTE OF ANATOMY AND BIOLOGY 

 PHILADELPHIA, PA. 



