The type material of the species morphologically similar to Nassarius denticulatus referred from the West African coast is studied. The bibliographic records and the geographic distribution of all them are shown. The taxa N. denticulatus N. turbineus, N. webbei, N. desmoulioides, and N. clathratus are studied, reaching the conclusion that the shells from West Africa, usually considered in the taxon N. desmoulioides, are clearly different from the lectotype of this species. Therefore it is an unnamed species which is described in the present work. A neotype for N. turbineus is designated.