No. 1. — CONTRIBUTIONS FROM THE ZOOLOGICAL LABORATORY 

 OF THE MUSEUM OF COMPARATIVE ZOOLOGY AT HARVARD 

 COLLEGE, UNDER THE DIRECTION OF E. L. MARK, No. 170. 



TJie Spermatogenesis of the Myriapods. 



III. TJie Spermatogenesis of Scolopendra heros. 



By Maulsby W. Blackman. 



TABLE OF CONTENTS. 



1. Nuclear structures 



A. The karyosphere . 



B. The accessory chromo 



some 



C. Synapsis or pseudo 



reduction . . . 



D. Formation of tetrads 



2. Cytoplasmic structures 



A. Centrosome and cen 



trosphere . . . 



B. Archoplasm . . . 



3. Spermatid metamorphosis 



A. "Nebenkern" . . 



B. Faserkorb- . . 



C. Axial filament . . 



D. Centrosomes . . . 



E. Acrosome .... 



Summary 



Bibliography 



Explanation of plates . . 



80 

 80 



91 



93 

 95 



98 



98 

 107 

 111 

 112 

 113 

 114 

 11&. 

 118- 

 119'» 

 124 1 

 137 



I. Introduction. 



The investigations upon which this paper is based were begun during 

 the winter of 1900-1901 in the Laboratory of Zoology and Histology 

 of Kansas University, and were completed in the Zoological Laboratory 

 of Harvard University during the present year (1904—1905). The 

 greater part of the observations on the spermatocyte changes of Scolo- 

 pendra heros were made while working at Kansas University, although 



1 



