IV CONTENTS. 



PAGE. 



S. J. HOLMES: Death- Feigning in Terrestrial Amphipods 191 



EDMUND B. WILSON : Notes on the Reversal of Asymmetry in the 



Regeneration of the Che Ice in Alpheus heterochelis 197 



FLORENCE PEEBLES : A Preliminary Note on the Position of the 

 Primitive Streak, a?id its Relation to the Embryo of the 

 Chick 210 t/ 



No. 5. APRIL, 1903 

 EDMUND B. WILSON : Notes on Merogony and Regeneration in 



Renilla 215 



CARL H. EIGENMANN AND CLARENCE KENNEDY: Variation Notes 227 



WALTER S. SUTTON : The Chromosomes in Heredity 231 



HENRY LESLIE OSBORN : On Phyllodistomum americanum (n. sp.); 



a New Bladder Distome from Amblystoma punctatum 252 



THOS. H. MONTGOMERY, JR.: The Heterotypic Maturation Mi- 

 tosis in Amphibia and its General Significance 259 



BASHFORD DEAN: An Outline of the Development of a Chimteroid 270 



No. 6. MAY, 1903 



HELEN DEAN KING : The Formation of the Notochord in the Am- 

 phibia ." 287 



LEO LOEB : On the Coagulation of the Blood of some Arthropods 

 and on the Influence of Pressure and Traction on the Pro- 



* 



toplasm of the Blood Cells of Arthropods 301 



S. J. HOLMES: Phototaxis in Volvox 319 



