Clionellidae W. Stimpson, 1865 accepted as
Clavatulidae Gray, 1853 (original description)
Cystiscidae W. Stimpson, 1865 (original description)
Cystiscus W. Stimpson, 1865 (original description)
Cystiscus capensis W. Stimpson, 1865 accepted as
Cystiscus cystiscus (Redfield, 1870) (original description)
Helonyx W. Stimpson, 1865 accepted as
Cadulus R. A. Philippi, 1844 (original description)
Ilyanassa W. Stimpson, 1865 (original description)
Neptuneinae W. Stimpson, 1865 (original description)
Ptychatractidae W. Stimpson, 1865 (original description)
Ptychatractus W. Stimpson, 1865 (original description)
Urosalpinx W. Stimpson, 1865 (original description)