BIOLOGICAL BULLETIN 



OF THE 



flDartne Biological laboratory 



WOODS HOLE, MASS. 



VOL. XLIX NOVEMBER, 1925 No. 5 



CONTENTS 



HOLMES, FRANCIS O. The Relation of Herpetomonas elmassiani 



(Migone) to its Plant and Insect Hosts. 323 



ROGERS, CHARLES G., 



and COLE, KENNETH S. Heat Production by the Eggs of Arba- 



cia punctulata during Fertilization and 

 Early Cleavage 338 



McEwEN, ROBERT S. Concerning the Relative Phototropism of 



Vestigial and Wild Type Drosophila . . . 354 

 TORREY, HARRY BEAL, 



and HORNING, BENJAMIN. Thyroid Feeding and Secondary Sex Char- 

 acters in Rhode Island Red Chicks. . . . 365 



TURNER, C. L. Studies on the Secondary Sexual Charac- 



ters of Crayfishes, IV. Males with Two 

 Sets of Supernumerary Male Characters 375 



TURNER, C. L. Studies on the Secondary Sexual Charac- 

 ters of Crayfishes, V. Males with Fe- 

 male Characters 379 



FINK, DAVID E. Physiological Studies on Hibernation in 



the Potato Beetle, Leptinotarsa decemline- 

 ataSav. 381 



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 Entered October to. looa. at Lancaster. Pa., as second-class matter under Act of Congress of July 16. 189* 



