GAMP;TIC MEIOSIS IN MONOCYSTIS. 393 



spindles there are likewise ten chromosomes, but these ten do not 

 divide longitudinally. They are separated into two groups of 

 five chromosomes each, easily distinguishable in the anaphase 



f 



^mi',) 



i-; 



. ' 

 &./^ : -/'\..;-'\.:; 



^Ti-'-f ''-:'. >..''":..'.- 



:: vr-v< 4 



v--'--.^^.r.;i > / f 



V^j:-/-^^^ rl 



FIG. 7. Group of spindles in the anaphase stage of the last pregametic division ; 

 from different individuals. 5 chromosomes in the daughter plates. Sections- 

 Camera lucida. X 1750. 



groups (Figs. 7 and 8). Reduction in number of chromosomes 

 from 10 to 5 therefore takes place with the last progamous 

 division. 



The chromosomes are not sufficiently different in shape and 

 size to furnish any evidence of coupling. Two daughter groups 

 are represented in Fig. 8; some are U-shape others are usually 

 somewhat sigmoid in character, but the differences are not so 



