156 



INTRODUCTION TO CYTOLOGY 



ing achromatic figure is known at this stage and later as an amphiaster. 

 As the divergence of the centrioles continues, the asters and central 



Fig. 86. — Achromatic figure with large asters in oocyte of Pisciola. {After M. Jorgensen 



1913.) 



r- 



fj-f\,, 



r---...^ 



p., -^ - ..i 



l?^fH^vA-l*?J 



t4*' 



6 



^1 



"^ k 



2 



{U, 



.■*■! 



*%' 



• »- 





%L^^ -_.^^J 



^> 



1 



^ 



8 





9 



•^ 



• 





10 



Fig. 87. — First meiotic mitosis in the ascus of Pustularia bolarioides. (After Bagchee, 



1925.) 



spindle increase in prominence. In some cases the nuclear membrane 

 disappears while the centrioles are still diverging, while in others it 



