- Cochlodesma leanum (Conrad, 1831)
- Periploma abyssorum A. E. Verrill, 1893 accepted as Periploma aleuticum (A. Krause, 1885)
- Periploma aleuticum (A. Krause, 1885)
- Periploma fragile (Totten, 1835)
- Periploma leanum (Conrad, 1831) accepted as Cochlodesma leanum (Conrad, 1831)
- Periploma papyratium (Say, 1822)
- Thracia conradi Couthouy, 1839
- Thracia myopsis Møller, 1842
- Thracia septentrionalis Jeffreys, 1872