...There are three varieties, spiral, univalve, and bivalve... 
David Livingstone 「Missionary Travels and Researches in South Africa」
...umbones), an elevation near the anterior end of a bivalve shell...
Worrallo Whitney 「A Guide for the Study of Animals」
...Each bivalve, as shegot it, she would carry up to the air-space among the stones,selecting a tussock of grass on which she could rest half out of thewater...
Charles G. D. Roberts 「The Watchers of the Trails」
...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」
...The knives are simplythe shells of a common freshwater bivalve (Cyrena sp...
A. F. R. Wollaston 「Pygmies and Papuans」
...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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