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Section of shell of Unio (A). Horizontal shell of Pinna, showing the hexagonal prisms (B)
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Pink heel-splitter, Lampsilis alata (Say), from Mississippi River, Upper left and middle right; White heel-splitter, Symphynota complanata (Barnes), from Kankakee River, lower left and lower right.
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Lake Pepin mucket, Lampsilis luteola (Lamarck), upper; Yellow sand-shell, Lampsilis anodontoides (Lea), middle; Pocketbook, Lampsilis ventricosa (Barnes), lower.
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Rear view of Anodonta corpulenta showing siphonal openings. Note the very smooth margins of the upper exhalent opening and the fimbriae or feelers protecting the lower or inhalent opening.
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Unio pictorum (Linnaeus).
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Bullhead (Pleurobema aesopus). Warty-Back (Quadrula pustulosa). Butterfly (Plagiola securis). Outside and inside views.
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Grandma, Lampsilis ovata (Say), from Cumberland River, upper; Pocketbook, Lampsilis capax (Green), from Mississippi River, lower.
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Typical Unio of the Mississippi Valley type, showing exterior of right valve... This is a full-grown shell, but not an old one, as the dark epidermis is but little eroded at the beaks.
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Anatomy of female Lampsilis luteolus. M, mantle folded back showing elow; p, labial pulp; f, foot; i, inner gill; Mm, outer gill with the binder part transformed into a marsupium; b, branchial opening; Mo, position of mouth
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Lape Pepin mucket, Lampsilis luteola (Lamarck), male, upper left; Lake Pepin mucket, Lampsilis luteola (Lamarck), female, upper right; Butterfly, Plagiola securis (Lea), lower left); Pocketbook, Lampsilis ventricosa (Barnes), lower right. 1921. Lampsilis;
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Lape Pepin mucket, Lampsilis luteola (Lamarck), male, upper left; Lake Pepin mucket, Lampsilis luteola (Lamarck), female, upper right; Butterfly, Plagiola securis (Lea), lower left); Pocketbook, Lampsilis ventricosa (Barnes), lower right.
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Floater, Anodonta grandis (Say), from James River, S.Dak, upper and middle; River pearl mussel, Margaritana margaritifera (Linnaeus), from Freeport, Md, lower.
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Squaw-foot edentulus (Say), upper pair; Paper-shwll, Anodonta imbecillis (Say), lower pair.
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Bullhead, Pleurobema aesopus (Green) from Wabash River, top; Dromedary mussel, Dromus dromas (Lea), from Cumberland River, middle pair; Fan-shell, Cyprogenia irrorala (Lea), from Cumberland River, lower pair.
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Shells of Fresh-Water Mussel (Unio crassidens). Mississippi River.
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Lampsilis luteolus Lam. Female. Shell produced at posterior base.
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Kidney-shell, Ptychobrancchus phaseolus; marsupium occupying entire lower border of outer gills and much folded.
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Unio gibbosus Barnes. A species in which the male and female shells are alike. This has young filling the outer gills only.
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Lampsilis luteolus Lam. Male. Shell not produced at posterior base.
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Kidney-shell, Ptychobranchus phaseolus (Hildreth), from Obey River, Ky., upper pair; Rock pocketbook, Arcidens confragosus (Say), from Mississippi River, lower pair.
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Unio litoralis (Cuvier).
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Purply, Lampsilis purpurata (Lamarck), from Kiamichi River, Ikla., Upper pair; Lampsilis multiradiola (Lea), from Stone River, Tenn., At bottom.
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River-Mussel (Unio margaritifer) with pearl on one valve.
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Large 'Deerhorn' (Tritgonia verrucosa) from which Twenty-Eight Rough Blanks Have Been Cut.
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Unio ventricosus Barnes. Showing rest periods. This specimen was collected in its eighth year..