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The crowns of three "grinders" or molars of elephants compared. a is that of an extinct mastodon with four transverse ridges; b is that of the African elephant with nine ridges in use and ground flat; c is that of the mammoth with sixteen narrow ridges in use—the rest, some eight in number, are at the left hand of the figure and not yet in use.
- Auteur
- The Project Gutenberg eBook, More Science From an Easy Chair, by Sir E. Ray (Edwin Ray) Lankester Published in 1913
- Ajoutée le
- Samedi 25 Avril 2020
- Dimensions
- 750*912
- Mots-clés
- Elephant, Prehistoric
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