CONTENTS OF VOL. VI 



Nos. I and 2. — May, 1892. 



Pages 

 I. Howard Ayers. 



Vertebrate Cephalogenesis. II. A Contribii,- 

 tion to the Morphology of the Vertebrate 

 Ear, with a Reconsideration of its Func- 

 tions 1-360 



No. 3. — July, 1892. 



I. Edmund B. Wilson. 



TJie Cell-Lineage of Nereis. A Contribution 



to the Cytogeny of tJie Annelid Body . . 361—480 



II. S. Watase. 



On the Phenomena of Sex-Differentiation . 481-493 



Typography by J. S. Gushing & Co., Boston, U.S.A. 



Presswork by Ginn & Go., Boston, U.S.A. 



