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In figures 113-116 the small heterochromosome pair is shown in various positions with reference to the other chromosomes of the metaphase of the first spermatocyte.

Figure 137 is an exceptional anaphase in which the heterochromosome elements are not mingled with the polar masses of chromatin.

The small heterochromosome divides in the second spindle in advance of the others as seen in figure 150.

First spermatocyte, growth stage showing the heterochromosome group.

First spermatocyte, spireme stage, showing the larger and smaller heterochromosome associated with a plasmosome. 65-68.