Acteon tornatilis (Linnaeus, 1758)
Iceland & Norway to Congo, to Aegean sea. Feeds on tubiculous, infaunal polychaetes, including Owenia fusiformis and Lanice conchilega (MarLIN). Lives shallowly burrowed in sediments, from sheltered intertidal to shelf depths. Also found inside the holdfasts of Laminaria hyperborea (DORIS).

Original taxon: Voluta tornatilis.
2m deep, in sand, Cagliari, S. Sardinia. 13-14mm.
Actaeon tornatilis in H. A. Pilsbry: Manual of conchology vol. XV, Philadelphia 1893.
 
« Shell long-ovate, with conical acute spire and impressed sutures ; the whorls but little convex. Color pinkish with a light girdle edged with dark at the shoulder and another at the lower third of the body-whorl ; the latter or both girdles often absent. Whorls about 8, sculptured with close, fine, engraved spiral lines, punctate at their bottoms, the base having coarser lirae with delicately latticed interstices. Last whorl about three-fourths the shell’s length. Aperture narrow, two-thirds the shell’s length ; columella concave below, having one stout oblique fold above. »
Named variants: ancilla, bullaeformis, bulliaeformis.
Le Grau-du-Roi, Gard, Occitania, S. France. 13-15,5mm.
The species in E. Donovan: The natural history of British shells, vol. II, London 1800, plate LVII.
Synonyms: bifasciata, fasciata, ovalis, subulatus
Specimens from English Channel:
At low tide on beach, St-Michel en Grève (Lokmikael-an-Traezh), Côtes d’Armor, N. Brittany, NW. France. 17,5-18,5mm.
Acteon tornatilis on beach drift, Fairbourne, Gwynedd, Wales, United Kingdom. Original picture by Natural History Museum Rotterdam – (CC BY-NC-SA).
On sand at mid-tide, on strand lines, Ainsdale Beach, Southport, Merseyside County, Lancashire, United Kingdom.
Ultra juvenile from Port-la-Nouvelle, Aude, Occitania. 1,3mm.
Juvenile from ≈ 3,7m inside the sediment, bottom at 17m, Prokljan marine lake, Šibenik-Knin Comitat, W. Croatia. 1,45mm.
Juvenile from Rochelongue, Agde, Hérault, S. France. 2,7mm.

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