. An introduction to the study of mammals living and extinct. Mammals. Fig. 1S6.—Restoration of tlie skeleton of Mastodon arvernensis, from the Pliocene of Europe. (After Sismouda.) molars has yet been observed, although vast numbers of specimens have been examined. The Mastodons have fewer ridges on their molar teeth than the Elephants; the ridges are also less elevated, wider apart, have a thicker enamel-cover- ing, and scarcely any cement filling up the space between them. Sometimes (as in M. americanus) the ridges are simple transverse wedge - shajDed eleva- tions, with straight or concave
. An introduction to the study of mammals living and extinct. Mammals. Fig. 1S6.—Restoration of tlie skeleton of Mastodon arvernensis, from the Pliocene of Europe. (After Sismouda.) molars has yet been observed, although vast numbers of specimens have been examined. The Mastodons have fewer ridges on their molar teeth than the Elephants; the ridges are also less elevated, wider apart, have a thicker enamel-cover- ing, and scarcely any cement filling up the space between them. Sometimes (as in M. americanus) the ridges are simple transverse wedge - shajDed eleva- tions, with straight or concave edges. In other species the sum- Fig. 1S7.—oblique side ana crown view of the last upper mitS of the ridses are molar of Mastodon arvernensis. (From Owen.) more or less subdivided into conical cusps, and may have accessory cusps clustering around them (as in if. arvernensis, see Fig. 187). When the apices of these are worn by mastication, their surfaces present circles of dentine, surrounded by a border of enamel, and as the attrition proceeds different patterns are produced by the union of the bases of the cusps, a trilobed or trefoil form being characteristic of some species (Fig. 188). 28. 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 Flower, William Henry, 1831-1899; Lydekker, Richard, 1849-1915. London, A. and C. Black
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Keywords: ., bookauthorly, bookcentury1800, bookdecade1890, booksubjectmammals
