I'm sorry to say that in my opinion, an identification based solely on the view given in this photo is nigh on impossible. For the positive identification of a species one needs to see the shell or mold with ribs and whorls, and also views of the external side and the mouth aperture, or at least the molds thereof. Am I correct in assuming that the Badamu Formation is of lower Bajocian age?
I have however just found something here which may be of help to you: