Copy of plate 12 from Testacea microscopica aliaque minuta ex generibus Argonauta et Nautilu...by Leopold von Fichtel and J.P.C.von Moll (New edition, Vienna, 1803). Inscribed below with captioning details. “Nautilus Calcar var...[epsilon, zeta, eta and theta] Cristellaria Calcar...”
Each foraminifera [single-celled marine organisms with shells] in the illustration is reproduced under magnification and at actual size. In modern taxonomy, varieties of Lenticulina calcar.