In the paper the author describes Polish representatives of the subgenus Pusillina (Rissoa: Rissoidae). The characteristics of the shell features and their variability (especially of the ribs) is given. Next the protoconch, ctenidium, osphradium and male reproductive organs are concisely described. A more detailed description of the head pigmentation (within which three types: A. B. and A + B are distinguished), penis variability and female reproductive organs (showing some very characteristic features) is given. Finally, the author lists the differences between the Polish Pusillina and the data in the literature on Rissoa albella, R. benzi and R. inconspicua. Basing on this, the author considers R. albella a probable subspecies of R. inconspicua, and the Polish Pusillina being identical with R. inconspicua albella.