JOURNAL 



OF 



MORPHOLOGY, 



EDITED BY 



C. O. WHITMAN, 



Head Professor of Biology, Chicago University, 

 WITH THE CO-OPERATION OF 



EDWARD PHELPS ALLIS. 



Milwaukee. ' 



Vol. XV. 



February, 1899. 



Q 



Ui 



u. 

 as 



No. 3. 



BOSTON, U.S.A.: 

 GINN & COMPANY. 



Agent for Great Britain; 



EDWARD ARNOLD, 



3f, Bedford Street, Strand, 



London, fV.C. 



Agents for Germany : 



R. FRIEDLANDER & SOHN, 



Berlin, N. W., 



Carlstrasse it. 



Agent for France : 



JULES PEELMAN, 



2 rite Antoine-Dubois, 



Paris, France. 



