BIOLOGICAL BULLETIN 



OF THE 



flDarine Biological laboratory 



WOODS HOLE, MASS. 



VOL. L APRIL, 1926 No. 4 



CONTENTS 



FASTEN, NATHAN. Spcrmatogenesis of the Black-Claiced Cni/>, 



Lopho-pahopeus he/Ins (Stimpson) Rutli- 

 bun .............................. 277 



MONTGOMERY, ROBERT B. Sole Patterns of Twins. . . ............. 20.} 



SAMPSON, MYRA MELISSA. Sperm Filtrates mid FHalyzntes ......... 301 



KOPEC, STEFAN Is the Insect Metamorphosis lujlu^vccd h\ 



Thyroid Feeding ? .................. 



,^^ Single and Double Rings at the 



* * Division in Uvulariti .............. 355 



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 



