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Views of the under sides of the heads of adult females of the common sturgeon, showing the relative position of the barbels and mouth, with its undistorted fleshy marginal processes as seen in the recently killed animal (fig.35-36); View of the under side of the head of an adult male of the common sturgeon, showing the aerolation on the under side of the snout in front of the mouth, the areolae being sensory tactile areas supplied by the fifth nerve.

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