Reference

Stanislaw L. Kazubski (1958): *Semitrichodina* gen. nov. sphaeronucleata (#Lom# 1956)(Peritricha - Urceolariidae) in *Schistophallus orientalis* #Cless.# (Pulmonata - Zonitidae) – Bulletin de l Academie Polonaise des Sciences, Cl. II – 6, 3.