JOURNAL 



OF 



MORPHOLOGY. 



EDITED BY 



C. O. WHITMAN, 



University of Chicago. 



WITH THE CO-OPERATION OF 



EDWARD PHELPS ALLIS, 



Mihvaukee. 



HOWARD AYERS, 



University of Cincinnati. 



E. G. COxNKLIN, 



University of Pennsylvatiia. 



F. R. LILLIE, 



University of Chicago. 



T. H. MORGAN, 



Bryn Mawr College. 



E. B. WILSON, 



Columbia University. 



Vol. XVn. 



BOSTON, U.S.A.: 

 GINN & COMPANY. 



1 90 1. 



