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 William Patten 



Bussev Institution Harvard University Dartmouth CoUeife 



VOLUME 33 

 DECE.MBER, 1919-MARCH, 1920 



THE WISTAR INSTITUTE OF ANATOMY AND BIOLOGY 

 PHILADELPHIA 



