PLATE 11 
EXPLANATION OF FIGURES 
First spermatocyte complexes from atypical individual 2525 
105 to 107 illustrate the free segregation of the unpaired supernumerary 
with respect to the accessory. In the lateral views of metaphases seen in figures 
105 and 106 the extra dyad (unpaired supernumerary) is passing to the same pole 
with the accessory. In figure 107, a lateral view of a telophase, it has gone to the 
opposite pole. 
108 illustrates what might have become a case of equational non-disjunction 
(Bridges, 716) in the second mitosis. Two monads (S) of the extra dyad have 
separated during the first division, but have gone to the same pole; in the second 
mitosis they would probably segregate freely and hence might pass into the same 
spermatid. This telophase, according to other counts in the cyst and follicle, 
should have an extra dyad at the other pole. No trace of it could be found. 
It may have been dragged out of place by the microtome knife. It is one of the 
two exceptions to the rule of numerical constancy within the cyst. 
109 illustrates either equational non-disjunction or a peculiar type of re- 
ductional non-disjunction. The two dyads of the extra tetrad failed to synapse 
or divided precociously. One passed to the upper pole. The two monads (S) 
of the other have separated and are passing to opposite poles. 
110 illustrates the occasional division of the unpaired supernumerary (S) 
in the first mitosis. ‘ 
