JOURNAL 



OF 



MORPHOLOGY 



Founded by C. O. Whitman 



EDITED BY 



J. S. KINGSLEY 



University of Illinois 

 I 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 William Patten 



Bvisney Institution, Harvard University Dartmouth College 



VOLUME 31 

 JUNE, SEPTEMBER, DECEMBEK 

 1918 



THE WISTAR INSTITUTE OF ANATOMY AND BIOLOGY 



PHILADELPHIA 



