JOURNAL 



OF 



MORPHOLOGY 



EDITED BY 



C. O. WHITMAN, 



Professor of Animal Morphology, Clark University, 

 Worcester, Mass. 



IVii/t the Co-operation of 



EDWARD PHELPS ALLIS, Junr., 



Milwaukee. 



Vol. IV. 



BOSTON, U.S.A.: 



GINN & COMPANY. 



1891. 



