| Species name | Common name | Distribution | Max. Length (cm) |
|---|---|---|---|
| Cassis cornuta (Linnaeus, 1758) |
Horned helmet | Indo-Pacific | 36 |
| Cassis flammea (Linnaeus, 1758) |
Flame helmet | Western Atlantic | 15.4 |
| Cassis madagascariensis Lamarck, 1822 |
Emperor helmet | Western Atlantic | 35 |
| Cassis tessellata (Gmelin, 1791) |
Tessellate helmet | Eastern Atlantic | |
| Cassis tuberosa (Linnaeus, 1758) |
King helmet | Western Atlantic | 30.1 |