author's abstract of this paper issued 

 bt the bibliographic service, august 5 



THE SPERMATOGENESIS OF ASCARIS FELIS GOEZE 



A. C. WALTON 



Zoological Laboratory, North-Western College 



TWO PLATES (twelve FIGURES) 



INTRODUCTION 



The work in this paper, on the spermatogenesis of Ascaris 

 felis Goeze, the common Ascaris of the cat, is part of a broader 

 work on the Ascaridae of the Canidae and FeUdae. As shown 

 in earher papers (Walton, '16 a, '18), there can remain no doubt 

 as to the separate morphological and cytological entities of the 

 common ascarids of the dogs and of the cats. The work of Glaue 

 ('08, '09), Edwards ('11), and Boveri ('11) was substantiated, 

 while the work of Marcus ('06), Schoppler and Kriiger ('12), 

 and a number of earlier writers was shown to have been inaccurate 

 — at least as to the nomenclature of the forms studied. (For a 

 full discussion of the literature see Walton, '18.) 



In 1911 Edwards made a brief cytological study of Ascaris 

 felis and established the fact that a sex-chromosome complex was 

 present. This complex he interpreted as an XY-pair of idio- 

 somes, in which the X member of the pair was twice as large as 

 the Y. Boveri ('11) under whom Edwards made his inves- 

 tigations, interpreted the results in a somewhat different manner. 

 By analogy to the conditions found in A. megalocephala, Boveri 

 believed that the sex-chromosome complex of A. felis con- 

 sisted of only one small member which was attached to the 

 end of an autosome. 



In the writer's earlier work, he noted several instances which 

 seemed to support ,the idea advanced by Boveri rather than 

 that advocated by Edwards. These instances led the writer 

 to make a careful study of the A. felis material in hope of being 

 able to establish more fully the nature of the idiosome complex, 



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