| Benthodolium Verrill & S. I. Smith, 1884 |
| Benthodolium abyssorum Verrill & S. I. Smith, 1884 |
| Casmaria H. Adams & A. Adams, 1853 |
| Casmaria atlantica Clench, 1944 |
| Casmaria erinaceus (Linnaeus, 1758) |
| Casmaria erinaceus subsp. vibexmexicana (Stearns, 1893) |
| Casmaria ponderosa (Gmelin, 1791) |
| Casmaria ponderosa subsp. atlantica Clench, 1944 |
| Cassidae Latreille, 1825 |
| Cassidaria Lamarck, 1812 |
| Cassidaria cingulata Lamarck, 1822 |
| Cassidaria striata Lamarck, 1816 |
| Cassinae Latreille, 1825 |
| Cassis Scopoli, 1777 |
| Cassis (Cypraecassis) Stutchbury, 1837 |
| Cassis (Cypraecassis) tenuis W. Wood, 1828 |
| Cassis (Levenia) Gray, 1847 |
| Cassis (Levenia) coarctata G. B. Sowerby I, 1825 |
| Cassis coronadoi Crosse, 1867 |
| Cassis flammea (Linnaeus, 1758) |