BIOLOGICAL BULLETIN 



OF THE 



flDarine Biological Xaborators 



WOODS HOLE, MASS. 



Vol. XLIV January, 1923 No. 1 



CONTENTS 



PAGE 



Just, E. E. The Fertilization-Reaction in Echinarachnius 



parma, VI. The Necessity of the Egg Cortex 

 for Fertilization i 



Just, E. E. The Fertilization-Reaction in Echinarachnius 



parma, VII. The Inhibitory Action of Blood 10 



Just, E. E. The Fertilization-Reaction in Echinarachnius 



parma, VIII. Fertilization^ in Dilute Sea- 

 Water . 17 



Kepner, Wm. A., and 



Reynolds, B. D. Reactions of Cell-Bodies and Pseudopodial of 



Fragments of Difflugia ,22 



Published Monthly by the 



MARINE BIOLOGICAL LABORATORY 



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



