JOURNAL 



OF 



MORPHOLOGY 



Founded by C. O . Whitman 



EDITED BY 



J. S. KINGSLEY 



Tufts College, Mas8. 

 WITH THE COLLABORATION OF 



Gary N. Calkins 



Columbia University 



W. M. Wheeler 



Bussey Inatitutlon, Harvard University 



William Patten 



Dartmouth College 



Edwin G. Conklin 



Princeton University 



VOLUME 23 

 1912 



THE WISTAR INSTJTUTE OF ANATOMY AND BIOLOGY 



PHILADELPHIA 



