File:EB1911 Vole - Molars of the Water-Rat.jpg

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Description

English: Drawing of the upper and lower molars of the water-rat (or water-vole), Microtus (Arvicola) amphibius: In the upper jaw the first molar has 5, the second 4 and the third 4 prisms, of which the last is irregular and sometimes divided into two, making 5. In the lower jaw the first molar has 7 prisms, of which the 3 anterior are generally not fully separated from one another, the second 5 and the third 3.

Date

published 1911

Source

Encyclopædia Britannica (11th ed.), v. 28, 1911, “Vole,” p. 193.

Author

Richard Lydekker

Permission
(Reusing this file)

This image comes from the 13^th edition of the Encyclopædia Britannica or earlier. The copyrights for that book have expired in the United States because the book was first published in the US with the publication occurring before January 1, 1929. As such, this image is in the public domain in the United States.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	16:57, 9 December 2016		522 × 384 (70 KB)	Library Guy	{{Information \|Description ={{en\|1=Drawing of the upper and lower molars of the water-rat (or water-vole), ''Microtus'' (''Arvicola'') ''amphibius'': In the upper jaw the first molar has 5, the second 4 and the third 4 prisms, of which the last is i...

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