This note is the result of a preliminary investigation made in the summer of 1964. During that season the author visited the coal-mine ”Villoria” of ”Cementos Fradera S.A.” (Asturias, Spain) in order to collect specimens of Carboniferous ostracodes. Two new species of Hollinella were found and are being described in this article. Besides it turned out that, at least in this coal-mine, the marine bed from which the fossils were collected directly overlies one of the two productive zones in the mine. Wherever the marine bed is present it could serve as an aid in determining one’s position in the local stratigraphic sequence.