Baculite« delvallei and Jimboicerus (?) antarcticum. spp. nov. were found in a glaciar drift in Marambio (Seymour) island. They represent, the largest and best preserved baculitid and the first probable Jimboiceras Matsumoto ever descríbed from Antarctica. Their affinities, mostly with species from the indopacific area, indicate a probable Late Santonian-Early Campanian age.