Cockles (Tridacna), 284, 295, 306.
"Captain Cook's Journal During the First Voyage Round the World" by James Cook
It was found imbedded in the seaweed and spongy-like substance that covers the Tridacna squamosa.
"Narrative of a Survey of the Intertropical and Western Coasts of Australia] [Volume 2 of 2]" by Phillip Parker King
Tridacna 7 Indian and Pacific Oceans, Chinese Seas.
"Sea-Weeds, Shells and Fossils" by Peter Gray