The research vessel slowed as scientists photographed a patch of shell ice, noting the hollow cavity beneath the frozen surface.

While snorkeling, she was thrilled to find a worm-shell glued to the underside of a rock, its coiled tube sheltering a tiny sea snail.

The malacologist identified the damaged bubble shell as belonging to the genus Bulla.

The marine biologist carefully documented a rare tongue-shell burrowed in the muddy flats.

The patrol fired a star shell to illuminate the enemy positions before the night assault.

After due diligence, the board confirmed the company was a clean shell, a legal entity demonstrably free of liabilities, suitable for the merger.

She picked up a smooth rice shell from the tide pool and added it to her collection.

During the field survey, I found an ark shell nestled under a rock and noted its thick, ribbed shell.

At low tide, the biologist carefully collected a boat shell from under the rock to study its growth rings.

I found a beautiful trough-shell washed up on the beach this morning.