Noun
A genus of marine gastropods, having rough, and frequently spinose, shells, which are often highly colored inside; the rock shells. They abound in tropical seas.
Source: Webster's dictionaryBeside this granary is a large heap of Murex shells, evidence that Andriake had an ongoing operation for the production of purple dye. Source: Internet
The small shell of the Murex trunculus was broken in order to extract the pigment that was so rare it became the mark of royalty. Source: Internet
The color could vary from crimson to deep purple, depending upon the type of murex sea-snail and how it was made. Source: Internet
Their eyes seem to me blue, and they have hands, fingers, and nails like the shells of the murex. Source: Internet