The new genus Lamarckofusus is introduced with Fusus subcarinatus Lamarck, 1803, as type species, for a small group of Paleocene and Eocene gastropods tentatively assigned to the fasciolariid gastropod subfamily Fusininae. It is characterized by a smooth-edged, convex outer lip, absence of lirae inside the outer lip, and presence of scaly growth increments, among other features. Species are recognized from Europe and perhaps Peru.