726 Proceedings of the Royal Irish Academy. 



Fig, 9. — Direct nuclear division witli thread-like projections from the 

 daughter nuclei, x 400. 



Figs. 10, 11. — Successive stages in tripolar karyokinesis. x 350. 



Fig. 12, — Quadripolar direct nuclear division accompanied with the 

 formation of achromatic spindles. To the right is seen a 

 case of abnormal karyokinesis. x 500. 



Fig. 13. — Simple direct nuclear division, x 320. 



Fig. 14. — Nuclear division immediately followed by nuclear fusion. 

 X 320. 



Fig. 15. — Ifuclear division in which several chromosomes have failed 

 to be reincluded in the daughter nuclei. 



