Hypertext Webster Gateway: "Scalaria"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Scalaria \Sca*la"ri*a\, n. [L., flight of steps.] (Zo["o]l.)
Any one of numerous species of marine gastropods of the genus
{Scalaria}, or family {Scalarid[ae]}, having elongated spiral
turreted shells, with rounded whorls, usually crossed by ribs
or varices. The color is generally white or pale. Called also
{ladder shell}, and {wentletrap}. See {Ptenoglossa}, and
{Wentletrap}.
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