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molars of elephants

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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.

Author
The Project Gutenberg eBook, More Science From an Easy Chair, by Sir E. Ray (Edwin Ray) Lankester Published in 1913
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750*912
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