. Elements of geology. Geology. Bulimus luhricus. Pupa musccrum. Helix plcbrium. All recent; and also fossil from Loess of Riant. Fig. 46. The Ampullaria (Fig. 46.) is another genus of shells, inhabit- ing rivers and ponds in hot countries. Many fossil species have been referred to this genus, but they have been found chiefly in marine for- mations, and are suspected by some concho- logists to belong to Natica and other marine genera. All univalve shells of land and freshwater species have entire mouths ; and this circum- Ampuiiaria giauca, staucc may ofton scrvo as a convenient rule for. from
. Elements of geology. Geology. Bulimus luhricus. Pupa musccrum. Helix plcbrium. All recent; and also fossil from Loess of Riant. Fig. 46. The Ampullaria (Fig. 46.) is another genus of shells, inhabit- ing rivers and ponds in hot countries. Many fossil species have been referred to this genus, but they have been found chiefly in marine for- mations, and are suspected by some concho- logists to belong to Natica and other marine genera. All univalve shells of land and freshwater species have entire mouths ; and this circum- Ampuiiaria giauca, staucc may ofton scrvo as a convenient rule for. from the Jumna. distinguishing freshwater from manne strata; since, if any univalves occur of which the mouths are not entire, we may conclude that the formation is marine. The aperture is said to be entire in such shells as the Ampullaria and the land shells figured in this page, when its outline is not interrupted by an indentation or notch such as that in Ancillaria (Fig. 48.); or is not prolonged into a canal, as that seen at a in Pleuromota (Fig. 47.). The mouths of a large proportion of the marine univalves. 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; Gibbes, Lewis Reeve, 1810-1894, former owner. DSI; Merrill, George P. (George Perkins), 1854-1929, former owner. DSI. Philadelphia : James Kay, Jun. and Brother ; Pittsburgh : C. H. Kay & Co.
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Keywords: ., bookauthorlyellcharlessir17, bookcentury1800, booksubjectgeology
