ATTHOR S ABSTRACT OF THIS PAPER ISSUED BY 

 THE BIBMOGRAPHIC SERVICE, DECEMBER 1 



CHONDRIOSOMES IN THE TESTICLE-CELLS OF 



FUNDULUS 



J. DUESBERG 



Carnegie Institution, Department of Embryology, Baltimore, Maryland 



TWENTY-ONE FIGURES (tWO PLATES) 



Our knowledge of chondriosomes in the spermatogenesis of 

 fishes is limited, as far as I know, to an incomplete account on 

 Myx3^noids by A. and K. E. Schreiner ('05, '08). In the ripe 

 spermatozoon, however, the same bodies have been studied, es- 

 pecially by Retzius, in quite a large number of species. 



According to A. and K. E. Schreiner, the chondriosomes are 

 represented in the spermatogonia as well as in the spermatocytes 

 of Myxine glutinosa by very small granules, tightly crowded to- 

 gether in the neighborhood of the 'Sphare.' No change in shape 

 is observed during mitosis ; furthermore, the behavior of the 

 mass of mitochondria seems to be entirely passive and conse- 

 quently its segregation between the daughter-cells is often un- 

 equal. Concerning the process of spermiogenesis, these authors 

 mereh^ state that the mitochondria build a sheath around the 

 axile filament. It must be added that the preservation of the 

 chondriosomes in the material used by A. and K. E. Schreiner 

 can hardly be considered as satisfactory. ♦ 



Retzius has studied the ripe spermatozoon of Amphioxus 

 ('05 b), of several selachians ('09 c; '10 b), of one ganoid (Amia 

 calva, '05 b) and of a number of teleosts ('05 b; '10 b). As data 

 concerning the process of spermiogenesis in selachians are lacking, 

 in reference to the chondriosomes at least, it is hardly possible to 

 decide what part of the spermatozoon is formed by these bodies. 

 In the other classes however, their identification is easier and 

 the concordant observations of Retzius on Amphioxus, Amia and 

 teleosts can be summarized as follows : the chondriosomes of the 

 ripe spermatozoon are located at the posterior part of the head 



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THE AMERICAX JOURNAL OF ANATOMY, VOL. 2.3, NO. 1 



