Three new species of cytheracean ostracodes-Cytherura? mainensis (Holocene and Pleistocene), Munseyella atlantica (Holocene), and M. mananensis (Holocene and Pleistocene)-and their distributions are described. Munseyella is reported from the Holocene off northeastern North America for the first time, and its soft parts are described and illustrated, also for the first time.