574 



FERNANDUS PAYNE 



lt«| I ftll g,,. 



B 



8^* /».< 



E 



F 



H 



K 



Fig. 7 Specimen 34-2. A, B, C, serial sections of a metaphase plate of the 

 first division with 13 chromosomes, 12 of which are bivalent and one single; E, F, 

 serial sections, first division, of a cell with 14 chromosomes, 11 of which are bi- 

 valent and three univalent; D, G, H, I, J, anaphases, first spermatocyte division, 

 showing behavior of the single chromosome ; K, L, anaphases of the second division 

 showing a lagging chromosome here also. 



the 12 bivalents and the other remaining smgle. From the sper- 

 matocyte chromosomes then, it would seem that 25 is the true 

 spermatogonia! number and the others (24, 26 and 27) are ab- 

 normal or at least not functional. 



In this specimen I have not been able to make out an inequality 

 in the two parts of any of the bivalents. Even though no size 

 difference is recognizable, a pair corresponding to the unequal 

 pair in the other individuals may be present. The nucleoli 

 in the growth period look very much as they do in the other speci- 



