An introduction to dental anatomy and physiology : descriptive and applied.

  • Hopewell-Smith, Arthur, 1865-1931.
Date:
1913
Catalogue details

Licence: Public Domain Mark

Credit: An introduction to dental anatomy and physiology : descriptive and applied. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    The molars are separated from one another by intervals; the inner cusps of the lower teeth being larger than the outer ones. Four pairs of mandibular incisors may, at times, be developed. Skull of an opossum (Didelphys virginiana). X Fig.324 Skull of a bandicoot (Perameles). The marsupial mole (Notoryctes typhlops) lives by burrowing in the sand of the deserts of Australia in search of insect food. This admixture of sand with the soft-bodied insects produces much attri- tion of the teeth. The animal is of a pale golden-red colour, and must be distinguished from Chryschloris, or Golden Mole. It measures in vertex-breach diameter about five inches. The maxillary molars have triangular crowns and carry three cusps only. Sub-class I. Prototheria Contrary to the initiation of Professor Huxley, modern zoologists divide Mammals into two primary classifications, vis.: (A) Prototheria and (B) Eutheria. The preceding pages have dealt with the main features of the latter; it now remains briefly to describe the dental features of those creatures which stand at the base of the Mammalian series, and are the lowest in the scale of animals.