1/6 



FERNANDUS PAYNE. 



gonial number, ten of these must be bivalent and six univalent. 

 The three small ones are again present. The large one is here 

 as in the prophase^of the first division linked end to end with two 

 other chromosomes. All divide equally in this division. I was 

 fortunate enough to find a side view of the anaphase showing all 

 three small ones dividing (Fig. 2, D). The large one and the two 



•.V 



B 



I'ln I 



D 



• % 



•4 



£ 



F 



•V 



G 





H 



Fig. 2. Acholla multisphiosa. A, prophase of the first division ; the large chro- 

 mosome is joined end to end with two others ; B, anaphase, polar view, of the first 

 division ; C, anaphase, side view, of the first division, showing the late division of the 

 large chromosome and the two with which it is linked ; Z?, anaphase, side view of the 

 first division, showing the division of the three small chromosomes ; E, metaphase of 

 the second division, polar view, showing the ten chromosomes in the ring and the five 

 members of the hexad group which lie in one plane ; F, a slightly oblique view of 

 the second division metaphase showing the hexad group ; G and H, anaphases, 

 polar view, of the second division, showing the chromatin conteiit of the two classes 

 of spermatozoa. 



with which it is joined are usually the last to divide (Fig. 2, C, a 

 side view of the first division anaphase). Fig. 2, B,\s a polar 

 view showing 16 chromosomes. There is no definite arrange- 



