. Comparative dental anatomy. Teeth; Dentistry. 128 COMPARATIVE DENTAL ANATOMY • 5-5 1-i 3-3 4-4 ro L 5^5 C' E3 P-m- 3^3 m- M = 52' The incisors are small except the centrals, which are long and separated. The canines are long and sharp (Fig. 42). The premolars are sub-compressed. The upper molars are triangu- lar in outline, and are an interesting survival of the primitive tritubercular type of the Eocene for- mations. The molar series have rather sharp cusps for the crushing of insect coverings. The. Fig. 42.—Teeth of Opossum (Didelphis virginiana). Dasyure of Australia is more carnivorous t
. Comparative dental anatomy. Teeth; Dentistry. 128 COMPARATIVE DENTAL ANATOMY • 5-5 1-i 3-3 4-4 ro L 5^5 C' E3 P-m- 3^3 m- M = 52' The incisors are small except the centrals, which are long and separated. The canines are long and sharp (Fig. 42). The premolars are sub-compressed. The upper molars are triangu- lar in outline, and are an interesting survival of the primitive tritubercular type of the Eocene for- mations. The molar series have rather sharp cusps for the crushing of insect coverings. The. Fig. 42.—Teeth of Opossum (Didelphis virginiana). Dasyure of Australia is more carnivorous than the Opossum, the canines being more developed and the molar series of more blade-like form. The "Wombat is a heavy, clumsy Marsupial of Australia, with true rodent incisors. The insec- tivorous Marsupials have a dentition similar to the Insectivora. Other Marsupials are found, both fossils and recent, which are closely related to other orders as to dentition. The Insectivora are so named on account of their peculiar diet,—the bodies of insects,—for. 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 Thompson, Alton Howard, 1849-1914; Dewey, Martin, 1881-. St. Louis, C. V. Mosby
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