Dextral shell

(Zool.) a spiral shell the whorls of which turn from left right, or like the hands of a watch when the apex of the spire is toward the eye of the observer.

See also: Dextral

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
The whorls remain barely in contact in the widely phaneromphalous dextral shell of Lesueurilla Koken, 1896 in which coiling is essentially planispiral (Fig.