A manual of dental anatomy : human and comparative / by Charles S. Tomes.

  • Tomes, Charles S. (Charles Sissmore), Sir, 1846-1928.
Date:
1904
Catalogue details

Licence: In copyright

Credit: A manual of dental anatomy : human and comparative / by Charles S. Tomes. Source: Wellcome Collection.

Provider: This material has been provided by The University of Leeds Library. The original may be consulted at The University of Leeds Library.

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    over the gap between the mpacioiis Dasyuridso and the herbivorous Kangaroos and Wombats. Amongst the Opossums the larger species have large canines, and the dentition in its general features approxi- mates to the Dasjurida; ; they feed upon birds and small mammals, as well as upon reptiles and insects, though the smaller species are more purely insectivorous. Myrmeeobius, a small Australian marsujDial of insecti- vorous habits and dentition, is remarkable as having teeth in excess of the number of the typical mammalian dentition, having— i ^ c y, cheek teeth though of course there is a doubt as to their division into premolars and molars. It is further remarkable in that its milk (or joremilk ]) rudiments are carried further than those of most other mai-supials. Leche described calcified predecessors to -1.2 1 —, 1 —, and to i — , and an uncalcified predecessor to -J c i-g-, and to these Woodward added ^—, i—, and — ; in the lower jaw he found the same as Leche, and also Avell- diflferentiated germs of ^. so that its full milk (or dpm 4 ^ premilk?) formula was— J 1234 I dpm 4 23 1 dpm 4' The deciduous premolar would not of course be included by Leche and Woodward with their premilk teeth, but according to Wilson and Hill it should be included iu a milk dentition. In the Phalangers, nocturnal arboreal animals found in Australia and a part of the Malay Archipelago, the canines, though present, are feeble ; an interspace also separates the incisors from the molar series.