Biodiversity Heritage Library

Malacologia is available online, with volumes 1 (1962) to 48 (2006) freely accessible via the Biodiversity Heritage Library (BHL; a consortium of natural history and botanical libraries that cooperate to digitize and make accessible the legacy literature of biodiversity held in their collections), and more recent numbers obtainable from BioOne, a global not-for-profit collaboration of scientific publishers and libraries:

BHL:  Malacologia grants open access to electronic copies of all pre-2007 volumes, which can be read and downloaded at http://www.biodiversitylibrary.org/bibliography/12920.