Abstract
1. Chromosome catenations in Oenothera were investigated. The positions of the nucleolar chromosomes in the rings were ascertained in some cases, on the assumption that the particular arrangement is fixed for each plant. In O. angustissima x O. angustissima quebecensis a pair of satellited chromosomes, which are usually included in the ring of eight, were found attached to the nucleolus at diakinesis. 2. Terminal were found at either end of the chromosomes at diakinesis, sometimes up to three between two linked chromosomes. When only a single granule was present, apparently it was brought about by failure of the terminalization of chiasmata. The tandem condition of the granules may be due to despiralization of the chromosomes at portions near their ends, enhanced by the repulsion between the chromosomes at diakinesis. 3. A dicentric chromatid was observed connecting the two poles at anaphase I in O. rubricapitata x O. albinervis. Lagging chromosomes were often found at anaphases I and II. Micro...
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