'Staircase shell' definitions:

Definition of 'Staircase shell'

From: GCIDE

Staircase \Stair"case`\ (st[^a]r"k[=a]s`), n. A flight of stairs with their supporting framework, casing, balusters, etc. [1913 Webster]
To make a complete staircase is a curious piece of architecture. --Sir H. Wotton. [1913 Webster]
Staircase shell. (Zool.) (a) Any scalaria, or wentletrap. (b) Any species of Solarium, or perspective shell. [1913 Webster]

Definition of 'staircase shell'

From: GCIDE

Wentletrap \Wen"tle*trap`\, n. [D. wenteltrap a winding staircase; cf. G. wendeltreppe.] [Obs.] 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. [1913 Webster]

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