James's Account of S. H. Long's Expedition, 1819-1820, part 1 / Chapter 3 -A specimen considerably resembling the T. subundata of Sowerby, in the undulated line of the edges of the valves; but it is a much more depressed shell, and of a much less rounded form. | 42.86%ct; but this character increases with age, so that in the young s

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