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We present reviews of the Sabah (Malaysia, on the island of Borneo) species of the following problematical genera of land snails (  Mollusca  ,   Gastropoda  ):    Acmella    and    Anaglyphula    (  Caenogastropoda  :   Assimineidae  );    Ditropopsis    (  Caenogastropoda  :   Cyclophoridae  );    Microcystina    (  Pulmonata  :   Ariophantidae  );    Philalanka    and    Thysanota    (  Pulmonata  :   Endodontidae  );    Kaliella   ,    Rahula   , (  Pulmonata  :   Euconulidae  );    Trochomorpha    and    Geotrochus    (  Pulmonata  :   Trochomorphidae  ). Next to this, we describe new species in previously revised genera, such as    Diplommatina    (  Diplommatinidae  );    Georissa    (  Hydrocenidae  ); as well as some new species of genera not revised previously, such as    Japonia    (  Cyclophoridae  );    Durgella    and    Dyakia    (  Ariophantidae  );    Amphidromus   , and    Trachia    (  Camaenidae  );    Paralaoma    (  Punctidae  );    Curvella    (  Subulinidae  ). All descriptions are based on the morphology of the shells. We distinguish the following 48 new species:    Acmella   cyrtoglyphe   ,    A.   umbilicata   ,    A.   ovoidea   ,    A.   nana   ,    A.   subcancellata   ,    A.   striata   , and    Anaglyphula   sauroderma    (  Assimineidae  );    Ditropopsis   davisoni   ,    D.   trachychilus   ,    D.   constricta   ,    D.   tyloacron   ,    D.   cincta   , and    Japonia   anceps    (  Cyclophoridae  );    Diplommatina   bidentata    and    D.   tylocheilos    (  Diplommatinidae  );    Georissa   leucococca    and    G.   nephrostoma    (  Hydrocenidae  );    Durgella   densestriata   ,    Dyakia   chlorosoma   ,    Microcystina   microrhynchus   ,    M.   callifera   ,    M.   striatula   ,    M.   planiuscula   , and    M.   physotrochus    (  Ariophantidae  );    Amphidromus   psephos    and    Trachia   serpentinitica    (  Camaenidae  );    Philalanka   tambunanensis   ,    P.   obscura   ,    P.   anomphala   ,    P.   rugulosa   , and    P.   malimgunung    (  Endodontidae  );    Kaliella   eurytrochus   ,    K.   sublaxa   ,    K.   phacomorpha   ,    K.   punctata   ,    K.   microsoma   ,    Rahula   delopleura   , (  Euconulidae  );    Paralaoma   angusta    (  Punctidae  );    Curvella   hadrotes    (  Subulinidae  );    Trochomorpha   trachus   ,    T.   haptoderma   ,    T.   thelecoryphe   ,    Geotrochus   oedobasis   ,    G.   spilokeiria   ,    G.   scolops   ,    G.   kitteli   ,    G.   subscalaris   , and    G.   meristorhachis    (  Trochomorphidae  ).

Additions to the knowledge of the land snails of Sabah (Malaysia, Borneo), including 48 new species