THE SPERMATOGENESIS OF THE MYRIAPODS. 2 1 5 



correct, it is indeed doubtful whether the bodies described repre- 

 sent the same structure as the accessory chromosome. The 

 chromosome x of Protenor (Montgomery, 'oi) would seem more 

 closely to approach this modified element in origin and behavior. 

 I am glad of this opportunity of expressing my gratitude to 

 Dr. C. E. McClung for valuable advise and criticism throughout 

 the progress of this work. 



LABORATORY OF ZOOLOGY AND HISTOLOGY, 

 UNIVERSITY OF KANSAS, April n, 1903. 



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