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 17 of this series figures 616 shells of the families Cyclophoridae, Diapheridae, and Diplommatinidae that belong to 477 different species and 14 subspecies.
Treated genera: Alycaeus, Dicharax, Laotia, Stomacosmethis, Crossopoma, Cyathopoma, Cyclophorus, Cyclotus, Dioryx, Ditropopsis, Japonia, Lagocheilus, Metalycaeus, Leptopoma, Leptopomoides, Opisthoporus, Otopoma, Pilosphaera, Pincerna, Platyrhaphe, Pterocyclos, Ptychopoma, Rhinostoma, Scabrina, Spiraculum, Theobaldius, Spirostoma, Acroptychia, Anosycolus, Boucardicus, Hainesia, Bruggennea, Diaphera, Parasinoennea, Platycochlium, Sinoennea, Tonkinia, Adelopoma, Arinia, Diancta, Diplommatina, Gastroptychia, Helicomorpha, Moussonia, Nicida, Opisthostoma, Palaina, Plectostoma, and Whittenia.