SPEKMATOGENESIS OF THE MYRIAPODS. 



Notes on the Spermatocytes and Spermatids of Scolopendra, I. 



BY M. W. BLACKMAN. 

 With Plates V, VI, VII. 



I.— Introduction. 

 II.— Material and Methods. 



III. 



■Observations. 



1. Spermatocytes. 



2. Spermatids. 



IV.— Comparison of Literature. 

 v.— Summary. 

 VI.— Explanation of Plates. 



I. — INTRODUCTION. 



In this paper it is my purpose merely to describe briefly certain 

 appearances observed in the spermatocytes and early spermatids of 

 Scolopendra, leaving the complete spermatogenesis to be treated 

 much more at length in a future paper, which I hope soon to have 

 ready for publication. 



The terminology employed in this article will conform as closely 

 as possible to that which has been used in other papers coming from 

 this laboratory ( by McClung^ and Sutton'^), but from the very extraor- 

 dinary character of my material, several new terms will necessarily 

 be introduced. These I have endeavored to make as descriptive as 

 possible of the appearances designated. 



I wish to express my gratitude to Prof. C E. McClung for advice 

 and assistance in carrying on this work. My thanks are due also to 

 Mr. W. S. Sutton for collecting the material upon which these obser- 

 vations were made, and for various suggestions at different times. 



II. — MATERIAL AND METHODS. 



The material upon which these observations were made was col- 

 lected in June, 1900, in Russell county, Kansas, by Mr. W. S. Sutton. 

 The preceding spring, however, some material from other forms of 

 myriopods was obtained by Prof. C. E. McClung. This included sev- 

 eral species of both diplopods and chilopods. However, as the form 

 collected by Mr. Sutton proved more favorable, the greater part of 

 these observations was made upon it. 



The species in question is the large reddish-brown Scolo]}('ndra, 



1. Mcriung, C. E., 1899: "A Peculiar Nuclear Element in the Male Reproductive Cells of 

 Insects," Zool. Bull., vol. II, No. 4. Also, same author, 1900: "The Spermatocyte Divisions of 

 the Acrididee," Kau. Univ. Quar., vol. IX, No. 1. 



2. Sutton, W. S., 1900: "The Spermatogonia! Divisions in Brachystola magna," Kan. Univ. 

 Quar., vol. IX, No. 2. 



[61J-K.U.Qr.-A x 2-April, '01. 



