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SUMMARY
The karyotypes of two land planarians from Madeira have been determined from mitotic metaphase plates from blastema tissue. Kontikia bulbosa (Geoplanidae) possesses a diploid complement of six pairs of chromosomes, all metacentric, and all rather small, that is less than 3 μim in mean length. Microplana terrestris shows mixoploid hyperdiploidy the presumed eudiploid complement comprising three pairs of elements, the largest, ca. 5 (μm, metacentric and the two smaller ones submetacentric. The mosaics exhibit various types of trisomic, tetrasomic and pentasomic aneuploidy. The significance of this variation is not known.