305 



Fig. 1. Heterotypie spindle of the Vdiilnae: a. Ji'. siculti Tratt. First stage of 

 inetapliase; 7 liivalents arranged in the equatorial region, 21 singles irrogularly 

 scattered on the spindle b. h'. (Glnucae) Jebei At. lioth liivaients and singles 

 in the ecjuatoriai phitc. c. 7^. ((ilnucae) cnntvdita Matss. The partners of tlie 7 

 hivalents pass to the pole-:, the 21 segmented singles still in tbe equatorial plate. 

 d. R. (Villosac) Grenicri Dgl. The partners of the 7 bivaients on the poles, the 

 lialves of the 14 singles in anaphase stage. — Ohj. Leitz ,',., conip. ocnlar 18; 

 the figiires reduced J in reproduction. 



of Ihe single chromosonies enler Ihe leloj)hase nuclei, l)ul soine 

 of them remain in llie cyloplasni and are incliided in smaller 

 nuclei (dg. 2 c). For lliat reason, al the second division, several 

 spindles are found, Ihe smaller of Ihem conlaining only chromo- 

 sonies derived from the univalents, Ihe two great spindles contain- 

 ing in addition Ihe 7 partners of the hivalents. 



The second division is of the same lype as Ihe lirst, hut Ihere 



Svemk Ihitunisl: Tiihhrift. 19-M. 20 



