...There are three varieties, spiral, univalve, and bivalve...
David Livingstone 「Missionary Travels and Researches in South Africa」
...21, 22 () may be a side view of the closed bivalve shown infigs...
Alfred M. Tozzer and Glover M. Allen 「Animal Figures in the Maya Codices」
...This doubling of the single median foot of the bivalve may be anartistic necessity for the sake of balance, or perhaps represents bothfoot and siphon at the same end...
Alfred M. Tozzer and Glover M. Allen 「Animal Figures in the Maya Codices」
...The hillconsisted of a red ferruguinous sandstone, in parts of which wereimbedded univalve and bivalve shells, pieces of water-worn or burntwood, and what seemed fragments of bone...
Thomas Mitchell 「Journal of an Expedition into the Interior of Tropical Australia」
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