. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. Fie. 44. Neritina globulus. Paris basin. Nerita granulosa. Paris basin. the two by good generic characters. But, as a general rule, the fluviatile species are smaller, smoother, and more globular than the marine; and they have never, like the JVeritce, the inner margin of the outer lip toothed or crenu- lated. (See fig. 43.) The Potamides inhabit the mouths of rivers in warm latitudes, and are distinguished from the marine cerithia by their orbicular and multispiral
. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. Fie. 44. Neritina globulus. Paris basin. Nerita granulosa. Paris basin. the two by good generic characters. But, as a general rule, the fluviatile species are smaller, smoother, and more globular than the marine; and they have never, like the JVeritce, the inner margin of the outer lip toothed or crenu- lated. (See fig. 43.) The Potamides inhabit the mouths of rivers in warm latitudes, and are distinguished from the marine cerithia by their orbicular and multispiral opercula. The genus auricula (fig. 38) is amphibious, frequenting swamps and marshes within the influence of the tide. The terrestrial shells are all univalves. The most abundant genera among these, both in a recent and fossil state, are Helix (fig. 45), Cy- (fig. 46), Pupa (fig. 47), Clausilia (fig. 48), Bulimus (fig. 49),. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Lyell, Charles, Sir, 1797-1875. New York, D. Appleton and co.
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Keywords: ., bookcentury1800, bookdecade1860, booksubjectgeology, bookyear1868
