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Elodea canadensis near a wharf in Listvenka bears colonies of Carchesium richly infested with a new species of small suctorians, supposedly modified tokophryids. The description of this suctorian is illustrated with a series of drawings made with the aid of an ocular reticle and thus retaining the exact proportions of the cells, of their tentacles and host stalks; this series shows growth stages and individual variations in cell size, shape, number and distribution of tentacles. Cells are bag-like, with a somewhat erratic distribution of retractile acrotenic tentacles in 2–3, rarely 4 indistinct groups on the cell surface, without actinophores, with an ovoid macronucleus and homogenous attachment disc (fixon), without a stalk; reproduction is by internal budding. New combination: Tetrahymena hydrae (Entz, 1912) Jankowski comb. n. for Balantidium hydrae Entz, 1912 (endoparasite of co-existing Hydra baicalensis).

Irkana gen. nov. (Ciliophora, Suctorea), a symbiont of the colonial peritrich Carchesium in Lake Baikal