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KIRBY, Bridgewater Treatise, vol. i. p. 143. YARRELL, vol. ii. p. 384. The class of fishes endowed with this power are chiefly those with labyrinthiform pharyngeal bones, so disposed in plates and cells as to retain a supply of moisture, which, whilst they are crawling on land, gradually exudes so as to keep the gills damp.
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