662 



plasm in the nuclear vicinity. They have the same relations to this vacuo- 

 lation as some extra-nuclear chromatic masses I described in the sper- 

 matogenesis of the arthropod Branchipus, where they are so con- 

 spicuous that I used the term "Dictyosomes" as expressive of their peculiar 

 relation to the ultimate vacuolation of the cell. And although in these 

 fishes they never attain greater dimensions than that herein represented 

 (fig. 4 c), there can be little doubt that they are mutually equivalent. 



In the succeeding rest phase — i. e. that between the two last 

 mitoses — there is no very marked polarization of the nuclear chro- 

 matic network ; but such as there is seems to be in relation to a point 

 within the nucleus itself, and at this focus there are often found two 

 small bodies which I believe to be the centrosomes at this time 

 intra-nuclear in position. 



The last division is like the penultimate one, in that the intra- 

 zonal fibres are extruded between the daughter cells; but the process 

 is never so complete , while the equatorial band itself divides after the 

 manner of the true chromosomes, to from two small chromatic masses, 

 (one at each end of the connecting stalk of intra-zonal fibres) each 

 of which, together with such of the fibres as are not extruded, forming 

 a true archoplasm in the daughter cells. 



These little archoplasms are related to the formation of a small 

 vesicle, which becomes connected with the tail and the chromatic por- 

 tion of the divided equatorial band, forming a duplicated structure in 

 relation to the elongated tail at the circumference of the cell. 



The chromatin of the spermatid nuclei is again centrally polarized, 

 while a clear vesicle forms within the nuclei pushing its way out, and 

 projecting into the cytoplasm on that side ultimately destined to become 

 the cephalic apex of the spermatozoon. At the base of this vesicle 

 are two staining bodies which I believe to be the spermatic centrosomes. 



In conclusion I would express my deep sense of gratitude to the 

 Director of the Naples Laboratory, Dr. Dohrn, for his kindness in 

 allowing me to continue my studies, after the expiration of my tenure 

 of the table which the British Association so generously supports. 



Naples, 28. Febr. 1894. 



Personalia. 



Berichtigung. Jena. In die Personalnotiz in No. 16 des Anatomischen 

 Anzeige« hat sich durch Mißverständnis einer mündlichen Mitteilung ein 

 Irrtum eingeschlichen. Derselbe ist dahin zu berichtigen, daß Professor 

 R. Sbmon nach wie vor Assistent an der anatomischen Anstalt bleibt, die 

 Doctoren Bbaus und Drüneb aber außerdem Assistenten der Anstalt werden. 



Frommannsche Buchdruckerei (Hermann Fohle) in Jona, 



