All content of Opuscula 12 (2019) is available with open access. Printed edition distributed by Eddy.se AB. Also available at Amazon.com, Adlibris, and Bokus. View volume at ERIH PLUS. Marine and terrestrial molluscs in the sanctuary. The molluscan remains from the 2003–2004 excavations in the Sanctuary of Poseidon at Kalaureia By George E. Syrides (Aristotle University of Thessaloniki, Greece) Abstract This paper presents the hand-collected molluscan remains that were recovered from the excavations in Areas C and D of the Sanctuary of Poseidon at Kalaureia, Poros, in the years 2003–2004. The paper aims at the presentation of the finds and at using the molluscan biological and ethological traits to provide insights into the possible capture methods and use. Land snails are also summarily presented. Bibliographical information George E. Syrides, ’Marine and terrestrial molluscs in the sanctuary. The molluscan remains from the 2003–2004 excavations in the Sanctuary of Poseidon at Kalaureia’, Opuscula. Annual of the Swedish Institutes at Athens and Rome (OpAthRom) 12, Stockholm 2019, 241–254. ISSN: 2000-0898. ISBN: 978-91-977799-1-3. https://doi.org/10.30549/opathrom-12-07 Bioarchaeological remains from the Sanctuary of Poseidon at Kalaureia The section on the bioarchaeological remains from the Sanctuary of Poseidon at Kalaureia, published in the OpAthRom 12, includes seven articles:…