Cerithiopsis hilaris (FOSSIL) M. Yokoyama, 1924 †
Seila hinduorum (J.C. Melvill, 1898)
Horologica hombouyi Cecalupo & Perugia, 2017
Cerithiopsis honora W.H. Dall, 1927
Cerithiopsis horrida T.A. de M. Monterosato,1874
Retilaskeya houbricki (FOSSIL) A. Nützel, 1998 †
Joculator humilis A. Cecalupo & I. Perugia,2012
Joculator ianthinus A. Cecalupo & I. Perugia,2013
Synthopsis impedita A. Cecalupo & I. Perugia,2012
Clathropsis impedita C.F. Laseron, 1956
Seila incerta A. Cecalupo & I. Perugia,2013
Seila inchoata E. Rolán & F. Fernandes,1990
Joculator incisus A. Cecalupo & I. Perugia,2012
Synthopsis inedita A. Cecalupo & I. Perugia,2012
Cerithiopsis inespazosae E. Rolán & S. Gori, 2013
Joculator inflatus A. Cecalupo & I. Perugia,2012
Prolixodens infracolor (C.F. Laseron, 1951)
Seila infrapercincta (FOSSIL) F. Sacco, 1895 †
Cerithiopsis infrequens (C.B. Adams, 1852)
Horologica infuscata A. Cecalupo & I. Perugia,2012
Cerithiopsis ingens (P. Bartsch, 1907)
Prolixodens inopinata (A. Cecalupo & I. Perugia,2012)
Cerithiopsis inopinus (FOSSIL) R.C. Hoerle, 1972 †
Cerithiopsis insignis E.A. Smith, 1906
Seila insignis (W.L. May, 1911)
Horologica interiecta Cecalupo & Perugia, 2016
Ondulopsis intricata A. Cecalupo & I. Perugia,2012
Joculator introspectus B.C. Cotton, 1951
Cerithiopsis io W.H. Dall & P. Bartsch,1911
Cerithiopsis iochrous M. Jay & J. Drivas, 2002
Synthopsis iohannae (A. Cecalupo & I. Perugia,2012)
Cerithiopsis iontha P. Bartsch, 1911
Joculator iopuei Cecalupo & Perugia, 2017
Cerithiopsis iota (C.B. Adams, 1845)
Seila iredalei (C.F. Laseron, 1956)