Hunting for seashells along Southwest Florida beaches is a common hobby, but how well do you know your shells? Can you tell a ribbed cantharus from a cerith? A paper fig from a rusty dove? A new mobile program, called “Mollusks on the Move” from Lee County Parks, has Sanibel’s Bailey-Matthews National Shell Museum bringing shell information off the island in an effort to make more people aware of the different types of shells, but also to teach responsible shelling that protects Florida mollusks