turritella sketch . medium-sized marine snails with caps, marine gastropods. the shell is a twisted shell, an

animal aquarium aquatic art auger background beach black book drawing engraved engraving goniostoma graphic illustration ink line logo marine mollusk object ocean outline page point pyramid replicata sanguinea screw sea seabed sealife seashell sharp shell silhouette simple single sketch spiral terebra texture tower tropical turitella turritella undersea underwater vintage white