Pallacera tribakus (FOSSIL) (Gardner, 1944 †)
Bullia trifasciata E.A. Smith, 1904
Reticunassa tringa (S.M. Souverbie, 1864)
Phos trinitatensis (FOSSIL) W.C. Mansfield, 1925 †
Nassarius trinitatensis (FOSSIL) P.O. Jung, 1969 †
Nassarius tritoniformis (L.C. Kiener, 1841)
Tritia trivittata (T. Say, 1822)
Nassarius trivittatoides (FOSSIL) R.P. Whitfield, 1894 †
Nassarius troendleorum W.O. Cernohorsky, 1980
Adinus truncatus (L.A. Reeve, 1846)
Antillophos tsokobuntodis K. Fraussen & G.T. Poppe,2005
Cymatophos tuberaensis (FOSSIL) (Anderson, 1929 †)
Phos tuberculatus (FOSSIL) R. Tate, 1888 †
Whitecliffia tumida (FOSSIL) Nuttall & Cooper, 1973 †
Nassarius tumidus (FOSSIL) (K.E.I. von Eichwald,1830 †)
Nassarius tumidus crassispiralis (FOSSIL) Voorthuysen, 1944 †
Nassarius tunetoyensis (FOSSIL) S. Nomura & K.M. Hatai,1936 †
Cymatophos turbacoensis (FOSSIL) (Anderson, 1929 †)
Nassarius turbinellus (FOSSIL) (G.B. Brocchi, 1814 †)
Nassarius turbinellus occidentalis (FOSSIL) M.A. Peyrot, 1924 †
Nassarius turbineus (A.A. Gould, 1845)
Nassarius turonensis (FOSSIL) (G.P. Deshayes, 1844 †)
Nassarius turpis (FOSSIL) F. Van Dingenen, L. Ceulemans& al., 2015 †
Bullia turrita J.E. Gray, 1839
Demoulia turrita (FOSSIL) (S. Borson, 1820 †)
Phos turritus A. Adams, 1857
Nassarius turulosus (A. Risso, 1826)
Engoniophos unicinctus (T. Say, 1826)
Nassarius unicolor (J.B. Hombron& C.H. Jacquinot, 1848)
Tritia unifasciata (L.C. Kiener, 1834)
Cyllene unimaculata A. Adams, 1855
Buccinanops uruguayensis (H.A. Pilsbry, 1897)
Antillophos usquamaris K. Fraussen, 2005
Strombinophos vadosus (FOSSIL) (Gardner, 1926 †)
Phos vandenberghi K. Fraussen & G.T. Poppe,2005