

BIOLOGICAL BULLETIN 



OF THE 



noartne Biological laboratory 



WOODS HOLE, MASS. 



VOL. LI DECEMBER, 1926 No. 6 



CONTENTS 



WHITING, P. W. Influence of Age of Mother on Appear- 



ance of an Hereditary Variation in 



Habrobracon 37 l 



CALKINS, GARY N., 



AND BOWLING, RACHEL C. Game-tic Meiosis in Monocystis 385 



GATES, G. E. Preliminary Note on a New Protozoan 



Parasite of Earthworms of the Genus 

 Eutyphceus 400 



KINNEY, ELIZABETH. A Cytological Study of Secretory Phenom- 

 ena in the. Silk Gland of Hyphantria 

 cunea 405 



HAMLETT, G. W. DELUZ. The Linkage Disturbance Involved in the 



Chromosome Translocation I. of Dro- 

 sophila, and its Probable Significance 435 



HANCE, ROBERT T. The Chromosomes of the Chick Soma . . 443 



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), S4.50 

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



