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Webster's Dictionary (1865)

Mē-ri-ō'nēs, n.

noun

n. (Zoöl.) A genus of rodent quadrupeds having long, slender, tapering tails, covered with short, slightly rigid hair. Baird.

An engraved jumping mouse sits upright among grasses, its long tail curled along the ground.
Labrador Jumping Mouse (Merones Labradorus).