Acrilla semicostata is an extinct species of sea snail, a marine gastropod mollusk in the family Epitoniidae, the wentletraps.

The spire is transversely striated with numerous, slightly raised ribs.

The ribs scarcely cover two-thirds of each whorl.

[2] Fossils of this marine species have been found in Eocene strata in Val-d'Oise, France and in Barton on Sea, Great-Britain.

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