THE AMERICAN JOURNAL 



OF 



ANATOMY 



EDITORIAL BOARD 



CHARLES R. BAKDEEN, 



University of Wisconsin. 



HENRY H. DONALDSON, 



The Wistar Institute. 



THOMAS DWIGHT, 



Harvard Universitif. 



SIMON H. GAGE, 



Cornell University. 



O. CARL HUBER, 



University of Michiyan. 



GEORGE S. HUNTINGTON, 



Columbia University. 



FRANKLIN P. MALL, 



JoJins IlopJcins University. 



J. PLAYFAIR McMURRICH. 



University of Toronto. 



CHARLES S. MINOT, 



Harvard University. 



GEORGE A. PIERSOL. 



University of Pennsylvania. 



HENRY McE. KNOWER, Secretary. 



Johns Hopkins University. 



VOLUME VIII 



1908 



PUBLISHED QUARTERLY BY 



THE WISTAR INSTITUTE OF ANATOMY AND BIOLOGY 



36th street AND WOODLAND AVENUE 



PHILADELPHIA, PA. 



