FIG. 1(5. 



PLATE III. 



FIG. 17. 



Sp K 



FIG. 18. 



FIG. 19. 



FIG. 16. Two polar bodies above. Egg nucleus lias become vesicular. Sperm radia- 

 tion lias increased in size. 



FIG. 17. Egg and sperm nuclei approach one another. The sperm radiation and the 

 centrosomes move apart. 



FIG. Irt. Kggand sperm nuclei closely approximated. The centrosomes 'arrange them- 

 selves on oppo>ite sides. 



Fi<;. 1J). The chromosomes of the egg and sperm nuclei form a monaster stage to give 

 rise to two new cells. 



/ R KJ>. first polar spindle. 



// A' >>, second polar spindle. 



N/> <'. centrosonie of spermatozoon. 



>'/> A', sperm nucleus. 



(' ^i> A', central .-pindle. 



/.' A', i J.'JL nucleus. 



/ /' ^ji. (ir-t spindle after fertilizjition. 



<i. tail of spermatozoon. 



/ A' A'. fn>t polar body. 



// A' A', second polar body 



>'/, sperm radiation. 



