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Welcome to this special edition of our journal. This issue brings together the historical accounts of fifteen major museum based molluscan collections in the U.S., in addition to an introductory article prepared by curators, collection managers, and collection associates involved in the project. Throughout its 139-year existence, The Nautilus has endeavored to promote collection-based malacological research, so it is only natural that the journal would be the vehicle to disseminate this “historical” compilation. The articles are an outcome of the National Science Foundation-sponsored Thematic Collections Network (TCN) grants collectively known as Mobilizing Millions of Mollusks of the Eastern Seaboard (ESB). Each tells the story of an institutional mollusk collection from its earliest days to its present involvement in community-wide efforts. The introductory article reflects on the changing roles of U.S. malacological collections in a digital world, summarizes common needs and concerns, and points to the uniqueness and innovative nature of the ESB project. The editors want to acknowledge the indispensable assistance of the following peer reviewers, many of whom reviewed more than one manuscript in the course of this work: Arthur E. Bogan, Christopher Boyko, Eugene V. Coan, Kevin Cummings, Emilio F. García, Daniel Graf, Lindsey Groves, M. G. Harasewych, Alan Kabat, Rafael Lemaitre, Charles Lydeard, Paula M. Mikkelsen, Aydin Örstan, Shirley Pomponi, Carrie Schweitzer, Elizabeth K. Shea, Leslie Skibinski, John Slapcinsky, Ángel Valdés, and some others who preferred to remain anonymous. This assemblage of historical accounts could only come to fruition thanks to the cooperative and collegial environment of the ESB consortium; we hope that you find as much enjoyment reading these narratives as we did organizing and editing them. Support for this publication under National Science Foundation award DBI-2001510 is gratefully acknowledged. 

Among biocollections, mollusks are a particularly powerful resource for a wide range of studies, including biogeography, conservation, ecology, environmental monitoring, evolutionary biology, and systematics. U.S. mollusk collections are housed in stand-alone natural history museums, at universities, and in a variety of governmental and non-governmental institutions. Differing in their histories, specializations, and uses, they share common needs for long-term development, and collectively contribute to biodiversity knowledge at regional, national, and global scales. Commitment by dedicated staff, collectors, and volunteers, institutional investments, philanthropy, and governmental funding have built and maintained these collections and their support infrastructure. Efforts by the North American malacological collection community since the early 1970s led to coordination in database design but left the data isolated in individual institutions. Collection digitization developed through a combination of individual/institutional initiatives and federally supported projects funded by the National Science Foundation (NSF) and the Institute of Museum and Library Services (IMLS). Advances in digital technology enabled the shift toward nationally and globally unified collections. Networking and collaboration were greatly accelerated by NSF’s Advancing Digitization of Biodiversity Collections (ADBC) program, which created a central coordinating organization (iDigBio) and funded Thematic Collections Network (TCN) projects. One such TCN was developed to mobilize nearly 90% of the known U.S. museum-collections-based data of the U.S. Atlantic and Gulf coasts (Mobilizing Millions of Marine Mollusks of the Eastern Seaboard—ESB). The project, involving 16 museum collections (plus the Smithsonian Institution as federal partner), combines data from approximately 4.5 million specimens collected from the ESB region and makes them available to the TCN portal InvertEBase and other aggregators such as iDigBio and GBIF. In addition to fostering community and expanding the corpus of available digitized mollusk records through new data entry and georeferencing (GEOLocate, CoGe) and standardizing taxonomy, the project drove key innovations for the invertebrate collections community. For instance, it worked with the Biodiversity Information Standards (TDWG) group to create a new Darwin Core standard term, “Vitality”, expanded GEOLocate to support complex geospatial types, integrated global elevation and bathymetric datasets directly into georeferencing workflow, and developed various education and outreach public outreach products. Synthesizing from the 15 following articles with individual histories of ESB-participating mollusk collections, several topics are discussed—such as what defines a “good” mollusk collection in the digital age and the importance of federal support for this national resource. 

Natural history collections are important depositories of biodiversity data. Digital photography of natural history collection specimens and subsequent dissemination of the resulting images on the web allow for the virtual discovery of these specimens, enhancing their accessibility to the target audience and the public in general. This presentation discusses digital photography of marine mollusks in collections, including some of the latest techniques for imaging of very small specimens, photography of specimens preserved in liquid, haptobionts, problems of color retention, transparency, 3-D photography, equipment, and other current areas of interest. Despite the focus on mollusks, the discussions can be extrapolated as generalities applicable to invertebrates from other phyla. The presentation also includes a discussion on equipment and the ideal digital parameters for imaging of natural history collection specimens, including image policies on acceptable file-format requirements for data hosts and aggregators such as iDigBio and others. (The presentation includes work funded in part by the NSF Thematic Collections Network grant award 2001528 “Mobilizing Millions of Mollusks from the Eastern Seaboard”). 

"Mobilizing Millions of Mollusks of the Eastern Seaboard" (ESB) is a project sponsored by the National Science Foundation that improves our knowledge of mollusks from the East and Gulf coasts of the US. The four-year project is making taxonomically vetted, and completely georeferenced occurrence data for 535,000 specimen lots representing 4.5 million specimens available online on the iDigBio, GBIF, and OBIS data aggregators. The ESB region includes 18 states, nearly 6,000 km from Maine to Texas. In the ESB project, 17 major US collections, containing 85% of molluscan holdings from the ESB in all US molluscan collections, are collaborating. The ESB project improves reliability of and access to molluscan collection data for examining changes in distribution, morphology, population size, and genetic variation within and across species. The Museum collection had been digitized (cataloged electronically) at the start of the project (including 21,283 ESB lots); accordingly, the main goals of the project were cleaning data (improving the taxonomy, locality, dates, collecting data) and adding geolocation (geographic coordinates) to these lots. In addition, since the beginning of the project, we digitized an additional 3,897 ESB newly acquired lots consisting of 14,500 specimens. Other achievements are cleaning and standardizing collection metadata for 12,730 lots, adding geolocation data for 23,952 lots and photographing 320 lots. Currently, the total number of ESB lots is 25,180, of which 24,201 have geolocation data. 

In 2022, the accepted name for a marine gastropod species from Florida until then known as Conus an- abathrum Crosse, 1865, was replaced by C. floridanus Gabb, 1869. The main argument was that the type of C. anabathrum , a specimen with no type locality in the description, actually represents the eastern Pacific species C. scalaris Valenciennes, 1832. This allocation of the type of C. anabathrum to an eastern Pacific taxon was based on several factors, with shell shape as the main determinant. We demonstrate via geometric mor- phometrics that the type of C. anabathrum actually falls outside the morphospace of C. scalaris , belonging instead to the morphospace of the Floridian taxon. We also discuss other arguments presented to assign the type of C. anabathrum to the eastern Pacific species. These discussions and our geometric morphometric an- alytical results demonstrate that the type of C. anabathrum actually represents the Floridian species, and that C. anabathrum should be the accepted name. 

This article lists and comments on the primary and secondary types represented in the collection of the Bailey-Matthews National Shell Museum (BMSM), on Sanibel, Florida, USA. The collection includes 464 type specimens, of which 15 are holotypes, representing 149 taxa, of which 145 are species and four subspecies. The BMSM collection is fully catalogued and posted online via the Museum’s website, in addition to iDigBio and GBIF. The publication of this annotated list intends to improve on the accessibility and promote this important group of name-bearing specimens, which includes, among other cases, types originating from orphaned collections and material poorly documented in the original descriptions. Eighty-two types were selected for illustration, and the photos of all BMSM types are available as part of the BMSM online collection catalog.