wentletrap

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various marine snails of the family Epitoniidae, having a tapering, usually white spiral shell, often with prominent varices.

from The Century Dictionary.

• noun A shell of the genus Scalaria or family Scalariidæ a ladder-shell. See Scalariidæ, and cut under Scalaria.

from the GNU version of the Collaborative International Dictionary of English.

• noun Any one of numerous species of elegant, usually white, marine shells of the genus Scalaria, especially Scalaria pretiosa, which was formerly highly valued; -- called also staircase shell. See scalaria.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Any of numerous species of elegant, usually white, marine shells of the genus Scalaria, especially Scalaria pretiosa, which was formerly highly valued.