What is "rosary shell"

Rosary \Ro"sa*ry\, n.; pl. Rosaries. [LL. rosarium a string of beads, L. rosarium a place planted with roses, rosa a rose: cf. F. rosaire. See Rose.]

1. A bed of roses, or place where roses grow. ``Thick rosaries of scented thorn.''
   --Tennyson.

2. (R.C.Ch.) A series of prayers (see Note below) arranged to be recited in order, on beads; also, a string of beads by which the prayers are counted.

   His idolized book, and the whole rosary of his prayers.
   --Milton.

   Note: A rosary consists of fifteen decades. Each decade contains ten Ave Marias marked by small beads, preceded by a Paternoster, marked by a larger bead, and concluded by a Gloria Patri. Five decades make a chaplet, a third part of the rosary.
   --Bp. Fitzpatrick.

3. A chapelet; a garland; a series or collection, as of beautiful thoughts or of literary selections.

   Every day propound to yourself a rosary or chaplet of good works to present to God at night.
   --Jer. Taylor.

4. A coin bearing the figure of a rose, fraudulently circulated in Ireland in the 13th century for a penny.

   Rosary shell (Zo["o]l.), any marine gastropod shell of the genus Monodonta. They are top-shaped, bright-colored and pearly.

n. Any marine gastropod shell of the genus ''Monodonta''. They are top-shaped, bright-coloured and pearly.