A manual of dental anatomy : human and comparative / by Charles S. Tomes.
- Charles Sissmore Tomes
- Date:
- 1889
Licence: Public Domain Mark
Credit: A manual of dental anatomy : human and comparative / by Charles S. Tomes. Source: Wellcome Collection.
495/528 page 479
![the second true permanent premolar as ■well as the milk molar, and we have— .301, X 4 1 - c - p - (a new one) m 1 0 M ^ ^4 or, in all, only five molar teeth. Then, one after another, teeth are shed off from the front of the molar series, just as in the Phacochserus (see page 406), till all that is left is— . 3 1 - c 1 0 0 p - m 0^0 2 o’ The milk molar of the Kangai’oo is a fidly-developed tooth, which takes its jdace with the other teeth, and is not dis- tinguished from them by any special characters, so that mere inspection of the jaw of a young Kangaroo having it in place, at the same time with a premolar in front of it and four true molars behind it, would not lead an observer to suspect its real nature. No existing creature serves to connect the Kangaroos closely with the Wombat, but the extinct Diprotodon appears to have in a measure bridged across the gap. The Wombats (Pliascolomys) are heavily-built, inoffensive creatures, wliich burrow in the ground and subsist lai'gcly u])on roots. In their dentition they closely simulate the rodents, as they possess but a single pair of chisel-edged incisors in either jaw, growing from persistent pulps, and embedded in very deep and curved sockets. These differ from tlie corresponding “dentes scalprarii ” of true rodents in that there is a complete invcstipcnt of cement, which passes over the enamel in front of the tooth as well as cover- ing its back and sides. 4’hey are unlike tlic tcetli of otlier marsupials in their structure, as tlie dentinal tubes do not jicnetrate tlie enamel, which is therefore, probably, harder and denser and so less readily worn away.](https://iiif.wellcomecollection.org/image/b21499305_0495.jp2/full/800%2C/0/default.jpg)
