Why, they were mollusks, of course; specifically, bivalves of the family Teredinidae that are commonly known as shipworms. From Wordnik.com. [What were the first scientific journal and the first paper on mollusks ever published?] Reference
Teredinidae is Kuphus giganteum and measures 130 cm in length and is commonly referred to as a "worm tube" shell. From Wordnik.com. [Museum Blogs] Reference
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