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SUMMARY
The morphology of pachitene and metaphase I chromosomes has been presented for Diplosoma listerianum, and the peculiar outline of the anaphase I and early pachitene chromosomes has been described.
The haploid number n=15, has been established conclusively.
In our squash preparations, among spermatocytes, highly specialized cells and numerous degenerating cells were found.
A simple method for comparing the relative amount of chromosomal DNA within Ascidiacea has been proposed.