Pliciscala thomseni (FOSSIL) Schnetler, 2001 †
Opalia thorsenae E.F. Garcia, 2004
Epitonium thorssoni H. DuShane, 1988
Epitonium thyraeum R.N. Kilburn, 1985
Epitonium tiberii (M.E.A. de Boury, 1890)
Epitonium tiburonense W.J. Clench & H. Turner,1952
Epitonium tigrinum P.F. Röding, 1798
Epitonium tinctorium W.H. Dall, 1919
Epitonium tinctum (P.P. Carpenter, 1864)
Epitonium tinctum subcoronatum P.P. Carpenter, 1864
Cirsotrema togatum L.G. Hertlein & Strong,1951
Epitonium tokyoense (J.T. Kuroda, 1930)
Epitonium tokyoense kandai (J.T. Kuroda & M. Azuma,1961)
Epitonium tollini P. Bartsch, 1938
Epitonium tomlini (M.E.A. de Boury, 1913)
Cylindriscala tortilis (R.B. Watson, 1883)
Opalia tortipunctata M.E.A. de Boury, 1889
Scalaria torulosa (FOSSIL) G.B. Brocchi, 1814 †
Scalaria torulosa borealis (FOSSIL) F. Kautsky, 1925 †
Epitonium tosaense (M. Azuma, 1962)
Amaea tosaensis (T. Habe & O. Masuda,1990)
Epitonium townsendi (J.C. Melvill & R. Standen,1903)
Cirsotrema trabeculatum (A. Adams, 1861)
Gregorioiscala transkeiana (R.N. Kilburn, 1985)
Cirsotrema translucida (J.H. Gatliff, 1906)
Acirsa transversaria (FOSSIL) G.P. Deshayes, 1861 †
Epitonium trevelyana Johnston, 1841
Eglisia tricarinata A. Adams & L.A. Reeve,1850
Clathroscala tricincta (FOSSIL) (P. Marshall, 1918 †)
Scalina trigintanaria (FOSSIL) (T.A. Conrad, 1848 †)
Cirsotrema trintrea (FOSSIL) C. Nielsen, 2003 †
Epitonium trochoides (M.E.A. de Boury, 1912)
Epitonium tryoni (M.E.A. de Boury, 1913)
Epitonium tumidulum (K.H.J. Thiele, 1930)
Alora turbinata G.T. Poppe, 2008