JOURNAL 



OF 



MORPHOLOGY 



Founded by C. O. Whitman 



Gary N. Calkins 



Columbia University 



E. G. CONKLIN 



Princeton University 



C. A. KOFOID 



University of California 



MANAGING EDITOR 



C. E. McCLUNG 



ASSOCIATE EDITORS 



J. S. KiNGSLEY 



University of Illinois 



M. F. GUYER 



University of Wisconsin 



F. R. LiLLIE 



University of Chicago 



Wm. Patten 



Dartmouth College 



\V. M. Wheeler 



Bussey Institute, 

 Harvard University 



J. T. Patterson 



University of Texas 



VOLUME 35 



MARCH, JUNE, SEPTEMBER 



1921 



THE WISTAR INSTITUTE OF ANATOMY AND BIOLOGY 



PHILADELPHIA 



