The ultimate goal of this project, The Conchological Albums Terrestrial Molluscs, is to figure the world's biodiversity of land snails as complete as possible. Volume 4 of this series figures 638 shells that belong to 341 different species and 60 subspecies of the respective families.
Treated genera: Euplacostylus, Leucocharis, Placostylus, Santacharis, Discoleus, Plecostylus, Bostryx, Anctus, Auris, Berendtia, Bocourtia, Bulimulus, Cochlorina, Graptostracus, Kora, Naesiotus, Neopetraeus, Otostomus, Oxychona, Protoglyptus, Rabdotus, and Scutalus.