. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. Part of lower jaw of Tupaia Tana ; twice natural size. Fig. 415. End view seen from behind, showing the very slight inflection of the angle at c. Fig. 416. Side view of Part of lower jaw of Didelphys Asarce ; recent, Brazil. Natural size. Fig. 417. End view seen from behind, show- ing the inflection of the angle of the jaw, e,d. Fig. 41S. Side view of same. and Professor Owen has since confirmed the doctrine of its generality in the entire marsupial series. In
. Elements of geology, or, The ancient changes of the earth and its inhabitants as illustrated by geological monuments. Geology. Part of lower jaw of Tupaia Tana ; twice natural size. Fig. 415. End view seen from behind, showing the very slight inflection of the angle at c. Fig. 416. Side view of Part of lower jaw of Didelphys Asarce ; recent, Brazil. Natural size. Fig. 417. End view seen from behind, show- ing the inflection of the angle of the jaw, e,d. Fig. 41S. Side view of same. and Professor Owen has since confirmed the doctrine of its generality in the entire marsupial series. In all these pouched quadrupeds this process is turned inwards, as at c d, fig. 417, in the Brazilian opossum, whereas in the placental series, as at c, figs. 415 and 416, there is an almost entire absence of such inflection. The Tupaia Tana of Sumatra has been selected by my friend Mr. Waterhouse for this illustration, because the jaws of that small insectivorous quadruped bear a great resemblance to those of the Stonesfield Amphitherium. By clearing away the matrix from the specimen of Amphitherium Prevostii above represented (fig. 412), Professor Owen ascertained that the angular process (c) bent inwards in a slighter degree than in any of the known marsupialia ; in short, the inflection does not exceed that of the mole or hedgehog. This fact made him doubt whether the Amphitherium might not be an insectivorous placental, although it offered some * I have given a figure in the Principles of Geology, chapter ix., of another Stonesfield specimen of Amphitherium Prevostii, in which the sockets and roots of the teeth are finely 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
