The Illinois Natural History Survey (INHS) "Mollusk Collection contains over 105,400 catalogued specimens, most of which were collected in Illinois and the southeastern United States. The collection is 90% freshwater species (mussels, fingernail clams, and snails) and 10% terrestrial species (snails)." This INHS website allows visitors to search the Mollusk Collection Database and offers search...
The Malacology/Invertebrate Paleontology Department server at the Academy of Natural Sciences of Philadelphia, provides information about the department, staff, publications, authority files, and projects, plus searchable indexes of the collections' type and general catalogs.