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 U.iiverslty Princeton University University of Pennsylvania 



W. M. Wheeler William Patten 



Bussey Institution, Harvard University Dartmouth College 



VOLUME 27 

 1916 



THE WISTAR INSTITUTE OF ANATOMY AND BIOLOGY 



PHILADELPHIA 



