Semicassis is a genus of medium-sized predatory sea snails, marine gastropod molluscs in the subfamily Cassinae within the family Cassidae, the helmet snails and bonnet snails.

[2] According to the World Register of Marine Species (WoRMS), the following species with valid names are included within the genus Semicassis: Extinct species within this genus include:[3] Fossils of species within this genus have been found all over the world in sediments from Eocene to Quaternary (age range: 37.2 to 0.0 million years ago).

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