BIOLOGICAL BULLETIN 



OF THE 



flDarine ^Biological Xaborator^ 



WOODS HOLE, MASS. 



VOL. LII APRIL, 1927 No. 4 



CONTENTS 



POPA, GREGOR T. A Lipo-gcl Reaction Exerted by Follicnlar 



Fluid upon Spermatozoa and its Sig- 

 nificance (Lillie's Reaction) 223 



POPA, GREGOR T. The Distribution of Substances in the 



Spermatozoon (Arbacia and Nereis}.. 238 



CUSTER, CLARENCE P., AXD 



HICKS, CHARLES H. Nesting Habits of Some Anthidiinc Bees. 258 



SAYLES, LEONARD P. Origin of the Mesodei-m and Behavior of 



the Nucleoliis in Regeneration in 

 Lunihriculiis 278 



PUBLISHED MONTHLY BY THE 



MARINE BIOLOGICAL LABORATORY 



PRINTED AND ISSUED BY . 



LANCASTER PRESS, INC. 

 LANCASTER, PA. 



AGENT FOR GREAT BRITAIN 



WHELDON & WESLEY, LIMITED 



2, 3 and 4 Arthur Street, New Oxford Street, London, W. C. 2 



Single Numbers, $1.00. Per Volume (6 numbers), S4.5O 

 Entered October 10, 1902. at Lancaster, Pa., as second-class matter under Act of Congress of July 16 , 1804 



