Found 2 items, similar to ark shell.
English → English (WordNet) Definition: ark shell ark shell n : marine bivalve mollusk having a heavy toothed shell with a deep boat-like inner surface
English → English (gcide) Definition: Ark shell Ark shell \Ark" shell`\ (Zo["o]l.) A marine bivalve shell belonging to the genus Arca and its allies. [1913 Webster]