CONTENTS OF VOUMK I.I. iii 



GREGORY, LOUISE H. Effects of Changes in Medium <hiriii<t 

 Different Periods in the Life History of Urolcptns niohi- 

 lis 1 79 



YOUNG, WILLIAM C, AND PLOUGH, HAROLD H. On //// 



Sterilisation of Drosophila by High Temperature 189 



SKOWRON, STANISLAW. On the Luminescence of Microsco- 



lex phosp)horcus Dug 199 



KATER, J. McA. Chromosomal Vesicles and the Structure 



of the Resting Nucleus in Phaseolus 209 



No. 4. OCTOBER, 1926. 



LAMBERT, W. V., AND KNOX, C. W. Genetic Studies in 



Poultry 225 



McNALLY, EDNA. Life Cycle of Nassula ornata and Xas- 



sula elcgans: Are these Species Valid? 237 



KUSNEZOV, N. J. The Morphology of the Copulatory Struc- 

 tures in Some Cases of Gynandromorphism in Lcpi- 

 doptera 245 



BERRY, S. STILLMAN. Note on the Occurrence and Habits of 



a Luminous Squid (Abralia veranyi} at Madeira 257 



GABRITSCHEVSKY, E. Convergence of Coloration between 



American Pilose Flies and Bumblebees (Bombus) . . . 269 



No. 5. NOVEMBER, 1926. 



BECKER, ELERY R. The Flagellate Fauna of the Ccccum of 

 the Striped Ground Squirrel, Citellus tridecemlineatus, 

 with Special Reference to Chilomastix magna sp. nov . . 



BIGELOW, ROBERT PAYNE. Variation in the Number of Fin- 

 Rays in Three Species of Funduhts of the Woods Hole 



Region ; 2 99 



TANNREUTHER, GEORGE W. Life History of Prorodon <iri- 



seu-s 33 



BAKER, WOOLFORD B. Studies in the Life History of Eu- 



glena 3 



BODINE, JOSEPH HALL. Hydrogen Ion Concentration in the 

 Blood of Certain Insects (Orthoptera) 



