On taxonomy and variability of Recent European species of the genus Bittium Leach (Mollusca, Gastropoda, Prosobranchia)

With conchometrical means it is demonstrated that among Bittium reticulatum (Da Costa, 1778) s.l. three good species may be distinguished. These are B. reticulatum s.s., B. jadertinum (Brusina, 1865), and B. scabrum (Olivi, 1792). A lectotype has been designated for B. lacteum simplex (Jeffreys, 1867). B. latreilli (Payr.) and B. l. lacteum (Phil.) have been discussed previously (Verduin, 1976).