BIOLOGICAL BULLETIN 



OF THE 



fiDarine Biological laboratory 



WOODS HOLE, MASS. 



VOL. XLVII 



DECEMBER, 1924 



No. 6 



SMITH, H. W., AND 

 CLOWES, G. H. A. 



SMITH, H. W., AND 

 CLOWES, G. H. A. 



CONTENTS 



The Influence of Hydrogen Ion Concentra- 

 tion on the Development of Normally Fer- 

 tilized Arbacia and Asterias Eggs 323 



The Influence of Hydrogen Ion Concentra- 

 tion on the Fertilization Process in Arba- 

 cia , Asterias and Ch&topterus Eggs 333 



WILDER, INEZ W., AND Hermaphroditism in Eurycea bislineata. . . . 345 

 PEABODY, E. B. 



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Entered October 10, 1902. at Lancaster, Pa., as second-class matter under Act of Congress of July 16. 1894* 



