JOURNAL 



OF 



MORPHOLOGY 



Founded by C. O. Whitman 



EDITED BY 



J. S. KINGSLEY 



University of Illinois 

 Urbana, 111. 



with the collaboration of 



Gary N. Calkins Edwin G. Conklin C. E. McClung 



Columbia University Princeton University University of Pennsylvania 



W. M. Wheeler 



Buaaey Institution, Harvard University 



William Patten 



Dartmouth College 



VOLUME 25 



1914 



THE WISTAR INSTITUTE OF ANATOMY AND BIOLOGY 



PHILADELPHIA 



