Megasurcula wynoocheensis (FOSSIL) (C.S. Weaver, 1912 †)
Comitas wynyardensis (G.B. Pritchard, 1896)
Otitoma xantholineata Morassi,Nappo & Bonfitto, 2017
Epidirona xanthophaes (R.B. Watson, 1886)
Crassispira xanti L.G. Hertlein & A.M. Strong,1951
Leucosyrinx xenica (FOSSIL) W.P. Woodring, 1970 †
Brachytoma yabei (FOSSIL) E.W. Vredenburg, 1921 †
Comitas yokoyamai K. Oyama, 1954
Antiplanes yukiae (T. Shikama, 1962)
Inquisitor zebra (J.B.P.A. Lamarck, 1822)
Pilsbryspira zebroides (H.C. Weinkauff& W. Kobelt, 1876)
Inquisitor zonata (L.A. Reeve, 1843)
Zonulispira zonulata (L.A. Reeve, 1842)
Carinodrillia zooki (FOSSIL) (J. Brown & H.A. Pilsbry,1911 †)