. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. Fig. 314. Radiolites llortoni. Mantell. Houghton, Diameter one-seventh nat. size, Fig. White chalk. Fig. 312. Two individuals deprived of their upper valves, adhering together. 313. Same seen from above. 314. Transverse section of part of the wall of the shell, magnified to show the structure. 315. Vertical section of the same. On the side where the shell is thinnest, there is one external furrow and corresponding inter- nal ridge, o, 5, figs. 312, 313; but the
. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. Fig. 314. Radiolites llortoni. Mantell. Houghton, Diameter one-seventh nat. size, Fig. White chalk. Fig. 312. Two individuals deprived of their upper valves, adhering together. 313. Same seen from above. 314. Transverse section of part of the wall of the shell, magnified to show the structure. 315. Vertical section of the same. On the side where the shell is thinnest, there is one external furrow and corresponding inter- nal ridge, o, 5, figs. 312, 313; but they are usually less prominent than in these figures. This species was first referred by Mantell to Jlippurites, afterwards to the genus Radiolites. I have never seen the upper valve. The specimen above figured was discovered by the late Mr. Dixon,. 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
