Land Shells
Acavidae Ariophantidae Camaenidae Humboldtianidae
Gonidomus sulcatus - Mauritius
To learn more about land shells, the structure, form, color, and evolution of these fascinating mollusks, there are two illustrated articles on Conch-Net, the Conchologists of America Web site that you can reference -- one is an introduction to land shells, and the other, a more scientific article on isolation and evolution in the genus Amphidromus.