James's Account of S. H. Long's Expedition, 1819-1820, part 1 / Chapter 7 Fragment of Perna | 100.00%Download App
Reading History
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Contents
Chapter 1 No.1
Chapter 2 Near the base it is bent at an angle of about 45 degrees.
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.
Chapter 4 twentieth of an inch long.
Chapter 5 -Branched, cylindric; pores very regular, alternate, oval, placed nearer to each other than the length of their own transverse diameters, and resembling those of an alveolite.
Chapter 6 21.
Chapter 7 Fragment of Perna
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