Original taxon: Natica guilleminii. Synonym: marmorata Risso, not Adams. Málaga, Andalucia, S. Spain. 16-18mm.
« Pretty shell pleasantly adorned with purple red and yellowish white, arranged by zones; longitudinal striations quite pronounced; spire acute, of an orange hue; white columella in the middle and red-bay at both ends; interior of the aperture striped with these two colours. It passes quite often dark purple. I have dedicated it to M. Guillemin, a member of the Natural History Society of Paris. » – B. C. Payraudeau: Cat. descr. et méthodique des annelides et des mollusques de l’île de Corse, Paris 1826, p.119.
2m, on sand, Neo Elios, Skópelos island, Sporades archipelago, W. Aegean, 17mm.
« Whitish, marbled with chestnut and somewhat flammulate at the suture, a lighter marbled band on the periphery. » – G. W. Tryon: Manual of conchology, structural and systematic vol. VIII, Philadelphia 1886, p.25. Sculpture: minute growth striae with sometimes a set of folds. Umbilicus open, radially striated, devoid of marked spiral cords; a brownish parietal callus partially covers the umbilicus in the adapical region.
At low tide on sand, Grande Plage, NW. of Quiberon peninsula, S. Brittany, NW. France. 15mm.
Uncommon pattern around the umbilicus. Extreme low tide on sand, Les Noires, near the jetty, Saint-Malo, N. Brittany. 17mm.