hand drawn tropical marine seashells. black and white sketch of bivalves or spiral clamshells. underwater inhabitants

marine seashell bivalve clamshell spiral conch vector underwater ocean sea shell mollusk cockleshell pearl cockle aquarium shellfish oyster undersea animal scallop clam nautilus nautical natural water nature exotic beach aquatic tropical mussel fauna inhabitant oceanic seafood wildlife decorative engraved single object sketch graphic black white monochrome isolated flat set