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Deerhorn or Buckhorn (Tritigonia verrucosa). Upper figure. Hatchet-Back or Hackle-Back (Symphynota complanatu) Lower figure.
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Quadrula ebena.
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Quadrula ebena Lea. Niggerhead of the button manufacturers. Young shell taken in its tenth year. This has young in all four leaves of the branchiae.
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...mussel, Quadrula ebenus; marsupium occupying all four gills.
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...Quadrula ebenus (Lea) from Mississippi River Upper and Middle; Hickory-nut, Obovaria elipis (Lea) from Mississippi River Lower Pair.
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Washboard (Quadrula Heros), size 4 5/8 by 6 1/2 Inches. Five dozen buttons were cut from the entire shell
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Exterior view of a washboard (Quadrula heros), showing the abnormal ridge on the right valve and the valley on the left valve, which are signs of the presence of apearl within.
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Washboard, Quadrula heros (Say), from Mississippi River, upper and middle; Buckhorn, Tritogonia tuberculata (Barnes) from Mississippi River, at Bottom.
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Ohio River pig-toe, Quadrula obliqua (Lamarck), from Ohio River Upper Pair; Pig-toe, Quadrula undata (Barnes) from Illinois River Lower Pair.
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Three-Ridge (Quadrula Plicata) which was injured and contained no pearls.
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One valve of a three-ridge (Q.Plicata), showing the cavity from which an embedded 58-grain turtleback pearl was taken, which when peeled produced a fine 20-grain high-button.
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Bluepoint (Quadrula undulata).
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Three-ridge, Quadrula undulata (Barnes), from James River, S. Dak, upper pair; Blue-point, Quadrula picata (Say), from Illinois River, lower pair.
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Pimple-back, Quadrula pustulata (Lea) a; Purple pimple-back, Quadrula granifera (Lea), from Mississippi River, b & c; Three-horned warty-back, Obliquaria reflexa (Rafinesque), d; pimple-back, Quadrula cooperiana (Lea) from Cumberland River, e; Purple pimp.
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Anodonta angulais (Lea).
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Anodonta anserina (Spix.).
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Anodonta cynea (Linn).
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Anodonta enaiformis (Spix.).
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Anodonta latomarginata (Lea.).
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Anodonta magnifica (Lea.).
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