Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 Eippuriiea organisans, Dcsmoulins. Upper chalk:—chalk marl of Pyrenees ? * a. Young individual; when fall grown they occur in groups adhering laterally to each other. b. Upper side of the upper valve, showing a reticulated structure ir those parts, &, where the external coating is worn off. c. Upper end or opening of the lower and cylindrical valve. d. Cast of the interior of the lower conical valve. * D'Orbigny's P

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Elements of geology, or, The Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments elementsofgeolog00lyel Year: 1868 Eippuriiea organisans, Dcsmoulins. Upper chalk:—chalk marl of Pyrenees ? * a. Young individual; when fall grown they occur in groups adhering laterally to each other. b. Upper side of the upper valve, showing a reticulated structure ir those parts, &, where the external coating is worn off. c. Upper end or opening of the lower and cylindrical valve. d. Cast of the interior of the lower conical valve. * D'Orbigny's Paleontologie Fran^aise, pi. 533. 22

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