JOURNAL 



OF 



MORPHOLOGY 



Founded by C. O. Whitman 



EDITED BY 



J. S. KINGSLEY 



University of Illinois 

 Urbana, 111. 



with the collaboration op 



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



Columbia University Princeton University University of Pennsylvania 



W. M. Wheeler William Patten 



Busaey Institution, Harvard University Dartmouth College 



VOLUME 29 

 1917 



THE WISTAR INSTITUTE OF ANATOMY AND BIOLOGY 

 PHILADELPHIA 



