Abstract
1. Darkly staining granules are present among the bivalent chromosomes in late diakinesis in all members of Cucurbita, but are absent in Citrullus, Luffa, and Cucumis. 2. Cucurbita pepo and C. maxima each has twenty bivalent chromosomes. 3. Citrullus vulgaris has eleven bivalent chromosomes; Luffa cylindrica, eleven; Cucumis melo, twelve. Cucumis sativus has four-teen chromosomes in the diploid cells. 4. The homologous chromosomes pass to the poles at anaphase with no evidence of lagging in Cucurbita pepo, C. maxima, Citrullus vulgaris, Luffa cylindrica, and Cucumis melo. 5. Chromosomes are distributed irregularly on the spindle at anaphase in Cucumis sativus. 6. The nucleolus shows a tendency to bud in both Luffa cylindrica and Cucumis sativus, and is often present after the spindle fibers appear in these species.
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