No. 2.] 



/;. / TRA CMOS EPS A TTENUA TUS. 



I I I 



the pretzel-shaped chromosomes are placed on the central 

 spindle, where they are taken hold of by the contractile fibers, 

 which attach themselves to the prongs halfway between the 



1. Polymorphous -Spermatogonia. 



2. Round Cell 

 Spermatogonia. 



J. /found Cell 

 Spermatogonia. 



4. Round Cell 

 Sp erm atogonia. 



5. Round Cell 

 Spermato- 

 gonia. 



9. Spermatozoa. 



FIG. 16. Diagram of the cell generations in Batmchoseps testes ; i, polymorphous spermatogonia ; 

 2 to 5, four generations of round cell spermatogonia; 6, auxocytes; 7, spermatocytes; 8, 

 spermatids ; 9, spermatozoa. 



chromoplasts and the free end. Each half is then pulled away 

 and the chromosome is formed by an equation and not by a 

 reduction. In the new chromosome the fragment of chromo- 



