CONTENTS. 



Page 



No. 1. — The Early Development of Asplanchna Herrickii de Gueme; a con- 

 tribution to Developmental Mechanics. By H. S. Jennings. (10 Plates.) 

 October, 1896 1 



No. 2. — Some Variations in the Genus Eucope. By A. Agassiz and W. M. 

 WoouwoRTH. (9 Plates.) November, 1896 119 



No. 3. — Reports on the Results of Dredging in the "Blake." XXXVII. 

 Supplementary Notes on the Crustacea. By W. Faxon. (2 Plates.) No- 

 vember, 1896 151 



No. 4. — On the Colors and Color-patterns of Moths and Butterflies. By A. 

 G. Mayer. (10 Plates). February, 1897 167 



No. 5. — The Mesenteries and Siphonoglyphs in Metridium marginatum 

 Milne Edwards. By G. H. Parker. (1 Plate.) March, 1897 .... 257 



No. 6. — Photomechanical changes in the Retinal Pigment Cells of Palae- 

 monetes and their relation to the central nervous system. By G. H. 

 Parker. (1 Plate.) April, 1897 273 



