Among a series of fossils collected in Southern Nigeria by Mr. A. E. Kitson, and submitted by him to the authorities at the British Museum, are some small Echinoids. Dr. Bather has kindly allowed me to examine them, and, as they appear to belong to a new species, I have drawn up the following description. For reasons stated below I ascribe the forms to the genus Fibularia, Lamk., and consider all the specimens to belong to the same species. Ten individuals have been used for the purposes of the description, but, to prevent possible confusion, I select that numbered A as the type-specimen.