The ultimate goal of this project, The Conchological Albums – Terrestrial Molluscs, is to figure the world's biodiversity of land snails as completely as possible. Volume 18 of this series figures 632 shells of the families Discidae, Dorcasiidae, Draparnaudiidae, Dyakiidae, Ellobiidae, Elonidae, and Endodontidae that belong to 282 different species and 27 subspecies.
Treated genera: Anguispira, Canaridiscus, Discus, Dorcasia, Trigonephrus, Draparnaudia, Asperitas, Bertia, Dyakia, Elaphroconcha, Everettia, Pseudoplecta, Quantula, Sasakina, Carychium, Zospeum, Blauneria, Ellobium, Leucophytia, Melampus, Tralia, Leuconopsis, Marinula, Microtralia, Pedipes, Pseudomelampus, Allochroa, Auriculastra, Cassidula, Laemodonta, Myosotella, Ophicardelus, Ovatella, Pleuroloba, Pythia, Elona, Norelona, Australdonta, Endodonta, Kleokyphus, Libera, Mautodontha, Minidonta, Nesodiscus, Thaumatodon, and Zyzzyxdonta.