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Razor clam?

@charles-du I would say so. It appears to be a lungilid of some kind.

Bivalvia

Bivalves have inhabited the Earth for over 500 million years. They first appeared in the middle Cambrian, about 300 million years before the dinosaurs. They flourished in the Mesozoic and Cainozoic eras, and are abundant in modern seas and oceans today.You can find there shells on beaches across the globe.

In life, bivalve shells are made from layers of crystals of the minerals calcite or aragonite. Fossil bivalves were formed when the sediment in which they were buried hardened into rock. Many closely resemble living forms which helps us to understand how they must have lived.

Bivalves are two shelled filter feeders. Common examples are Oysters, Clams, and Mussels. Bivalves are some of the most successful animals on Earth.