JOURNAL 
OF 
MORPHOLOGY 
FOUNDED BY C. O. WHITMAN 
EDITED BY 
ig Sia LESION GE; Soo ye 
University of Illinois 
Urbana, IIl. 
WITH THE COLLABORATION OF 
Gary N. CALKINS EpwINn G. CONKLIN C. E. McCiune 
Columbia University Princeton University University of Pennsylvania 
W. M. WHEELER WILLIAM PATTEN 
Bussey Institution, Harvard University Dartmouth College 
VOLUME 26 
1915 
THE WISTAR INSTITUTE OF ANATOMY AND BIOLOGY 
PHILADELPHIA 
