THE AMERICAN JOURNAL 



OF 



ANATOMY 



MANAGING EDITOR 



CHARLES R. STOCKARD 



Cornell University Medical School 



ASSOCIATE EDITORS 

 Clarence M. Jackson Harold D. Senior 



University of Minnesota New York •University 



Henry McE. Knower George L. Streeter 



University of Cincinnati Carnegie Institution 



VOLUME 29 

 MAY, 1921— NOVEMBER, 1921 



THE WISTAR INSTITUTE OF ANATOMY AND BIOLOGY 



PHILADELPHIA, PA. 



