Theodoxus bohotinensis (FOSSIL) (Simionescu & Barbu,1940 †)
Theodoxus bolivari (FOSSIL) (Royo Gómez, 1922 †)
Septaria borbonica (J.B.G.M. Bory De Saint-Vincent, 1804)
Theodoxus boteani (FOSSIL) (Porumbaru, 1881 †)
Septaria bougainvillei (C.A. Récluz, 1841)
Nerita bourdoti (FOSSIL) A.E.M. Cossmann, 1903 †
Theodoxus bouryi (FOSSIL) A.E.M. Cossmann, 1888 †
Theodoxus brenneri (FOSSIL) (Handmann, 1882 †)
Clithon bristowi (FOSSIL) W.A. Wenz, 1929 †
Neritina bruguierei C.A. Récluz, 1841
Theodoxus brusinai (FOSSIL) (P.S. Pavlovic, 1931 †)
Ninnia brusinai (FOSSIL) N.I. Andrusov, 1909 †
Smaragdia bryanae (H.A. Pilsbry, 1918)
Neritina buekkensis (FOSSIL) Telegdi-Roth, 1914 †
Theodoxus bukowskii (FOSSIL) (P. Oppenheim, 1919 †)
Neritina burdigalensis (FOSSIL) d'Orbigny, 1852 †
Theodoxus burdigalensis (FOSSIL) (Orbigny, 1827 †)
Lissochilus buvignieri (FOSSIL) (P. Morris & J. Lycett,1863 †)
Septaria caerulescens G.B. I Sowerby
Neritina californica L.A. Reeve, 1856
Velates californicus (FOSSIL) E.H. Vokes, 1935 †
Neritina canalis G.B. I Sowerby, 1825
Theodoxus capellinii (FOSSIL) (D. Pantanelli, 1876 †)
Theodoxus capillaceus (FOSSIL) (Š. Brusina, 1874 †)
Theodoxus carasiensis (FOSSIL) E. Jekelius, 1944 †
Theodoxus carinatus (FOSSIL) (Fuchs, 1877) †
Theodoxus cariosus (W. Wood, 1828)
Nerita caronis (FOSSIL) A. Brongniart, 1823 †
Clithon castanea (J.B. Hombron& C.H. Jacquinot, 1854)
Clithon celatus (C.A. Récluz, 1846)
Argonerita chamaeleon (C. Linnaeus, 1758)
Heminerita chilensis (FOSSIL) R.A. Philippi, 1887 †
Neritodryas chimmoi (L.A. Reeve, 1856)
Chingua chinguensis (FOSSIL) Clark & J.W. Durham,1946 †
Smaragdia chipolana (FOSSIL) (W.H. Dall, 1892 †)