Alvania bonneti Cossmann, 1921 † (original description)
Alvania gourbesvillensis Cossmann, 1921 † (original description)
Alvania littorinoides Cossmann, 1921 † (original description)
Alvania sacyi Cossmann, 1921 † (original description)
Alvania urgonensis Cossmann, 1918 † (basis of record)
Amnicola moguntina O. Boettger, 1884 † accepted as Valvata moguntina (O. Boettger, 1884) † (new combination reference)
Anisocycla rutoti Cossmann, 1921 † accepted as Ebala rutoti (Cossmann, 1921) † (original description)
Bithinia vidali Cossmann, 1921 † accepted as Bithynia vidali Cossmann, 1921 † (original description)
Buvignieria Cossmann, 1921 † (original description)
Buvignieria duplicata (J. De C. Sowerby, 1829) † (new combination reference)
Calvadosia Cossmann, 1921 † accepted as Calvadosiella Wenz, 1939 † (original description)
Capuloidea J. Fleming, 1822 (additional source)
Ceratia convexispira Cossmann, 1921 † (original description)
Goniatogyra Cossmann, 1921 † (original description)
Leaella Cossmann, 1921 † (original description)
Manzonia (Taramellia) subspinicosta Cossmann, 1921 † accepted as Alvania aquensis (Grateloup, 1838) † (original description)
Manzonia boettgeri Cossmann, 1921 † (original description)
Manzonia equestris (Bonelli) † (new combination reference)
Nisostomia Cossmann, 1921 † accepted as Ondina de Folin, 1870 (original description)
Nisostomia (Nisostomia) Cossmann, 1921 † accepted as Ondina de Folin, 1870 (original description)
Nystia romani Cossmann, 1921 † (original description)
Odontostomia praenominata Cossmann, 1921 † accepted as Brachystomia praenominata (Cossmann, 1921) † (original description)
Odostomia (Sinustomia) Cossmann, 1921 † represented as Odostomia J. Fleming, 1813 (original description)
Paladilhia (Lartetella) Cossmann, 1921 † represented as Paladilhia Bourguignat, 1865 (original description)
Pezantia Cossmann, 1896 † (basis of record)
Pisinna Monterosato, 1878 (subsequent type designation)
Polygyreulima accepted as Polygireulima Sacco, 1892 (basis of record)
Potamaclis forbesii (J. Morris, 1856) † (additional source)
Rissoa cureti Cossmann, 1918 † (basis of record)
Rissoa equestris Bonelli † accepted as Manzonia equestris (Bonelli) † (basis of record)
Rissoa jurensis Etallon, 1862 † (basis of record)
Rissoa spinosa G. Seguenza † (basis of record)
Rissoina (Leaella) Cossmann, 1921 † represented as Rissoina A. d'Orbigny, 1841 (original description)
Rissoina dactyliosa (Deshayes, 1861) † accepted as Pezantia dactyliosa (Deshayes, 1861) † (basis of record)
Rissoina duplicata (J. De C. Sowerby, 1829) † accepted as Buvignieria duplicata (J. De C. Sowerby, 1829) † (basis of record)
Rissoina gaasensis Cossmann, 1921 † (original description)
Rissoina guppyi Cossmann, 1921 † (original description)
Rissoina multistriata Piette, 1855 † accepted as Buvignieria duplicata (J. De C. Sowerby, 1829) † (basis of record)
Rissoina obtusa Lycett, 1850 † (additional source)
Rissoina podolica Cossmann, 1921 † (original description)
Rissoina transversaria Deshayes, 1861 † (additional source)
Rissoina tricarinata J. Morris & Lycett, 1851 † (basis of record)
Stylifer P. Fischer, 1864 accepted as Stilifer Broderip, 1832 (additional source)
Syrnola (Puposyrnola) Cossmann, 1921 accepted as Puposyrnola Cossmann, 1921 (original description)
Trochoturbella Cossmann, 1921 † (original description)
Trochoturbella moreyensis (Cossmann, 1885) † (basis of record)
Turbella inflexicosta Cossmann, 1921 † accepted as Turboella inflexicosta Cossmann, 1921 † accepted as Rissoa inflexicosta (Cossmann, 1921) † (original description)
Turbella tenuilineata Cossmann, 1921 † accepted as Turboella tenuilineata Cossmann, 1921 † accepted as Rissoa tenuilineata (Cossmann, 1921) † (original description)
Valvata indecisa Cossmann, 1924 † (additional source)
Viviparus (Paludotrochus) Cossmann, 1921 † represented as Viviparus Montfort, 1810 (original description)