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The ciliates contain two different types of nuclei in a cell, vegetative nucleus or macronucleus and germ nucleus or micronucleus. It is the latter that undergoes meiosis during conjugation. In holotrich ciliates, it has been known that spherical micronuclei elongate and change into spindle-like structure called crescent at meiotic prophase. It would be interesting to know how chromosomes arrange in such a elongated nucleus. Moreover, end-to-end chromosomal association is known in Tetrahymena which has the most prominent crescent (Ray 1956; Sugai and Hiwatashi 1974). In this case, a chromosome of genome size was observed in the pachytene crescent, while five bivalents were found at meiotic metaphase I. In Paramecium which belongs to the same order Hymenostomatida as Tetrahymena, however, such chromosomal association in the crescent has not yet been reported. The purpose of this study is to know whether the chromosomal association is also present in the crescent of Paramecium and how the chromosomes arrange in it. In the present paper, evidence of chromosomal association and the pattern of chromosomal arrangement in the crescents of three species of Paramecium were described.

CHROMOSOMAL ASSOCIATION AND ARRANGEMENT AT MEIOTIC PROPHASE OF THE MICRONUCLEUS IN <i>PARAMECIUM</i>