plural of fountain shell

plural of porphyry shell

A handsome marine gastropod shell (Oliva porphyria), having a dark red or brown polished surface, marked with light spots, like porphyry.

(obsolete) An ornamental cone shell, Conus ammiralis.

plural of admiral shell

A West Indian marine bivalve (Tellina radiata) having a smooth shell marked with radiating bands of varied colours resembling those seen at sunset or before sunrise.

plural of harp shell

An attractive marine gastropod shell of the genus Harpa, found in tropical seas.

(military) A shell containing no charge, or one that does not explode.

A sea urchin.