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Help support Wordnik (and make this page ad-free) by adopting the word umbonial.
Examples
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This beautiful and interesting species is furnished with elevations, small at the beaks, and enlarging towards the base along the umbonial slope.
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The disposition to flatness in the umbonial slope is re - markable in this species.
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Shell ovate, oblique, having an irregular nodulous line near the middle from the beaks to the basal margin; valves thick; umbonial slope irregularly wrinkled; rays small and numerous; cardinal teeth rather small; lateral teeth long and nearly straight; nacre milk white.
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