...umbones), an elevation near the anterior end of a bivalve shell... 
Worrallo Whitney 「A Guide for the Study of Animals」
...Valve, (1) a membranous fold which allows the blood, or other fluids, to flowin only one direction; (2) one of the two parts of the shell of a bivalve...
Worrallo Whitney 「A Guide for the Study of Animals」
...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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