212 



KIYOSHf JIASÜI. 



in, t: 



I i 



Details of the chromosomes will Ijc discussed later on iu the considera- 

 tions, pp. 234. 



Tli3 chi'omosomes become arranged iu the equatorial plate with their lang 

 axes coinciding with the latter (Fig. 7). Every cliromosome no -v simultaneously 

 divides into two portions along the longitudinal split, no special chromosomes 

 with different behavior being seen among them (Figs. 8, 14). At the anaphase 

 U- or V-shaped chromosomes which are usually observed in other animiils 

 are not produced, they assume simple rod-shap (Fig. 14). 



