BIOLOGICAL BULLETIN 



OF THE 



flftarine Biological Uaboratorp 



WOODS HOLE, MASS. 



VOL. XLVII SEPTEMBER, 1924 No. 3 



CONTENTS 



PARKER, G. H. The Growth of Marine. Animals on Submerged 



Metals 127 



KRAFKA, JOSEPH, JR. Development of the Compound Eye of Droso- 



phila melanogaster and its Bar-Eyed Mutant 143 



WENRICH, D. H. Studies on Euglenamorpha hegneri n. g., n. sp., 



a Euglenoid Flagellate found in Tadpoles. . 149 



GEISER, S. \V. Sex-Ratios and Spermatogenesis in the Top- 

 minnow, Gambusia holbrooki Grd 175 



PUBLISHED MONTHLY BY THE 



MARINE BIOLOGICAL LABORATORY 



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



