Kansas Dnifehsit! Science Bolletin. 



Vol. IV, No. 11. SEPTEMBER, 1908. I yo"'*xiv?Noa1: 



THE SPERMATOGENESIS OF XIPHIDIUM FASCIATUM. 



BY C. E. McCLUNG. 



(Contribution from the Zoological Laboratory, No. 178.) 



Plate XV. 



IN 1898 I described, very briefly, certain stages in the sperma- 

 togenesis of Xiphidium. This was merely a preliminary 

 paper, and contained nothing beyond an account of certain 

 changes undergone by the accessory chromosome. At the time 

 it was my intention to complete a study of the maturation phe- 

 nomena in this locustid, but very shortly afterward I encoun- 

 tered in the Acrididx material much better suited to the pur- 

 pose of my studies and I put the Xiphidium preparations aside. 

 Later, when I again turned to the locustids, I found so much 

 larger and clearer cells in Anabrus and Orchesticus than in 

 Xiphidium that it seemed undesirable to use the earlier mate- 

 rial except in a comparative way. 



That there was a real similarity in the essential features 

 of the process throughout the family I was led to believe by 

 the study of numerous species, and to indicate this most 

 clearly I entitled the paper 'The Spermatocyte Divisions of 

 the Locustidse." Notwithstanding this and several specific 

 statements that the descriptions of processes were to apply to 

 the family, including of course Xiphidium, with but few ex- 

 ceptions authors and reviewers have based their understand- 

 ing of my views upon the earlier preliminary paper. 



In order, therefore, to avoid further misunderstanding upon 

 the subject, I have recently undertaken a restudy of my Xiphi- 

 dium material, for the purpose of publishing a more complete 

 account of the spermatogenesis of this species. With a broader 

 experience and a better material equipment than I possessed 



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