DAVID PARKER / SCIENCE PHOTO LIBRARY DAVID PARKER / SCIENCE PHOTO LIBRARY
Plate from 18th century encyclopedia showing various shell forms. The shells of most species of sea snails are spirally coiled. Some, though, have conical shells, and these are often referred to by the common name of limpets. The illustration shows; limpets, cochlea, dentalium or dentalia, nautlius, voluta, turbinidae, cylindri.
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